BOLT ACTION RIMFIRE LONG GUN

Abstract

A bolt action firearm includes a receiver, a barrel coupled to the receiver, and a bolt assembly configured to operate within the receiver. The bolt assembly includes a bolt body, a bolt head coupled to the bolt body and having a clearance machined into a side of the bolt head, a front baffle configured to at least partially surround the bolt head, and a firing pin assembly including a hammer and a separate firing pin. The front baffle optionally is removable from the bolt head when rotated to a specific angle relative to the bolt head. The hammer is configured to actuate the firing pin. A magazine is configured to feed rimfire cartridges and has feed lips positioned to interface with the clearance of the bolt head during operation of the bolt assembly.

Description

CROSS REFERENCE TO RELATED APPLICATION

This application claims the benefit of U.S. Provisional Application No. 63/746,828, filed January 17, 2025, which is herein incorporated by reference in its entirety for all purposes.

TECHNICAL FIELD

The present disclosure relates to bolt action firearms, and more particularly to a bolt action rimfire firearm with a front-locking bolt assembly that simulates the operational characteristics of a centerfire rifle.

BACKGROUND

Bolt action firearms have long been popular among hunters, target shooters, and military personnel due to their reliability, accuracy, and simplicity of operation. These firearms typically feature a manually operated bolt mechanism that locks into place behind the cartridge chamber, providing a secure seal during firing. The bolt action design allows for precise control over cartridge loading and ejection, contributing to improved accuracy and reliability compared to some other firearm actions.

Rimfire cartridges, characterized by their primer being located within the rim of the cartridge base, have been widely used in small-caliber firearms for over a century. These cartridges are popular for their low cost, mild recoil, and relatively quiet report, making them ideal for small game hunting, target practice, and training purposes. However, the design of rimfire cartridges presents unique challenges for firearm manufacturers, particularly when attempting to create bolt action rifles that can reliably feed and extract these smaller, more delicate rounds.

Traditionally, bolt action rimfire rifles have been designed with rear-locking bolt mechanisms, which differ significantly from the front-locking systems commonly found in centerfire rifles. This disparity in design has led to differences in handling, ergonomics, and overall user experience between rimfire and centerfire bolt action rifles. As a result, shooters who are accustomed to centerfire bolt actions may find it challenging to transition to rimfire platforms, potentially impacting their training and performance.

Furthermore, the compact nature of rimfire cartridges often necessitates smaller, lighter rifle designs. While this can be advantageous in certain situations, it may not meet the needs of shooters who prefer the weight, balance, and ergonomics of full-sized centerfire rifles. Additionally, the reduced size of rimfire actions can limit their compatibility with aftermarket components and accessories designed for centerfire platforms, potentially restricting customization options for users.

As the popularity of precision shooting sports continues to grow, there is an increasing demand for rimfire rifles that can closely simulate the feel and operation of their centerfire counterparts. Such firearms could provide a cost-effective training solution for shooters looking to maintain proficiency with their centerfire rifles while benefiting from the lower ammunition costs associated with rimfire cartridges.

SUMMARY

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The present disclosure introduces an innovative bolt action firearm design for rimfire cartridges that simulates the operational characteristics of a centerfire rifle. Key advancements include a front-locking bolt assembly with an optionally changeable, reversible, or modular baffle for adjustable bolt stroke, a two-piece firing pin assembly, and a bolt head with specialized clearance to accommodate magazine feed lips.

In some examples, the disclosure describes a bolt action firearm that includes a receiver, a barrel coupled to the receiver, and a bolt assembly configured to operate within the receiver. The bolt assembly includes a bolt body, a bolt head coupled to the bolt body and having a clearance machined into a side of the bolt head, a front baffle configured to at least partially surround the bolt head, and a firing pin assembly. The front baffle is removable from the bolt head when rotated to a specific angle relative to the bolt head. The firing pin assembly includes a hammer and a separate firing pin, where the hammer is configured to actuate the firing pin. The firearm also includes a magazine configured to feed rimfire cartridges, with feed lips positioned to interface with the clearance of the bolt head during operation of the bolt assembly.

In some examples, the disclosure describes a method of operating a bolt action rimfire firearm. The method involves providing a bolt assembly including a bolt body, a bolt head coupled to the bolt body, and a front baffle at least partially surrounding the bolt head. The method includes rotating the bolt assembly to an unlocked position, retracting the bolt assembly to extract a spent cartridge case, advancing the bolt assembly to chamber a new cartridge from a magazine, and rotating the bolt assembly to a locked position. The bolt head includes a clearance machined into a side to provide space for feed lips of the magazine during the advancing, and locking occurs at a front portion of a receiver of the firearm.

In some examples, the disclosure describes a bolt assembly for a rimfire firearm that includes a bolt body, a bolt head coupled to the bolt body and including a clearance machined into a side of the bolt head, a front baffle configured to at least partially surround the bolt head, and a two-piece firing pin assembly. The front baffle is reversible to provide at least two different bolt stroke lengths. The two-piece firing pin assembly includes a hammer positioned in a rear portion of the bolt assembly and a separate firing pin positioned in the bolt head, where the hammer is configured to actuate the firing pin upon release.

The foregoing general description of the illustrative embodiments and the following detailed description thereof are merely exemplary aspects of the teachings of this disclosure and are not restrictive.

BRIEF DESCRIPTION OF FIGURES

Non-limiting and non-exhaustive examples are described with reference to the following figures.

FIG. 1 is a conceptual diagram illustrating a perspective view of a firearm configured for rimfire cartridges.

FIGS. 2A, 2B, and 2C are conceptual diagrams illustrating various views of a bolt assembly and a magazine for the firearm of FIG. 1.

FIG. 3 is a conceptual diagram illustrating an exploded view of the bolt assembly for the firearm of FIG. 1.

FIG. 4 is a conceptual diagram illustrating an exploded view of a bolt head assembly for the firearm of FIG. 1.

FIG. 5 is a conceptual diagram illustrating an isometric view of a magazine for the firearm of FIG. 1.

FIG. 6 is a conceptual diagram illustrating a perspective view of a bolt assembly in a locking position for the firearm of FIG. 1.

FIG. 7 is a conceptual diagram illustrating a cross-sectional view of a bolt assembly for the firearm of FIG. 1.

FIG. 8 is a conceptual diagram illustrating a perspective view of a bolt assembly with a translucent representation of components for the firearm of FIG. 1.

FIG. 9 is a conceptual diagram illustrating a perspective view of a bolt assembly showing a short stroke configuration.

FIG. 10 is a conceptual diagram illustrating a perspective view of a bolt assembly showing a rearward stop configuration with a long stroke baffle.

FIG. 11 is a conceptual diagram illustrating a perspective view of a bolt assembly with a modular baffle system.

FIG. 12 is a conceptual diagram illustrating a perspective view of a bolt assembly in an unlocked position with a long stroke configuration.

FIG. 13 is a conceptual diagram illustrating a perspective view of a bolt assembly with a front baffle partially removed at a 45-degree angle.

FIG. 14 is a conceptual diagram illustrating a rear perspective view of a bolt assembly with a front baffle partially removed at a 45-degree angle.

FIG. 15 is a conceptual diagram illustrating a perspective view of a bolt assembly in a locked position with a long stroke configuration.

FIG. 16 is a conceptual diagram illustrating a perspective view of a bolt assembly in a short stroke configuration.

DETAILED DESCRIPTION

The following description sets forth exemplary aspects of the present disclosure. It should be recognized, however, that such description is not intended as a limitation on the scope of the present disclosure. Rather, the description also encompasses combinations and modifications to those exemplary aspects described herein.

The present disclosure relates to a bolt action firearm configured for rimfire cartridges. In some cases, the firearm may incorporate a front-locking bolt assembly design that provides advantages over traditional rear-locking rimfire rifle configurations. The firearm may be designed to simulate the operational characteristics of a centerfire rifle while being adapted for use with rimfire ammunition.

In some cases, the bolt action firearm may feature compatibility with existing centerfire rifle components, such as stocks, triggers, and bolt handles. This compatibility may provide manufacturing advantages and allow for greater flexibility in firearm customization. The use of centerfire rifle components in a rimfire platform may also result in a firearm with increased weight and size compared to traditional rimfire rifles, which may be desirable for certain applications such as precision shooting competitions.

The front-locking bolt assembly design may offer potential accuracy improvements over rear-locking systems. In some cases, the front-locking design may allow for a more rigid lockup and reduced headspace variability. The bolt assembly may incorporate features to address challenges specific to rimfire cartridges, such as clearance for magazine feed lips and a two-piece firing pin assembly.

In some cases, the firearm may include a reversible front baffle that allows for easy adjustment between long and short bolt stroke configurations. This feature may enable users to customize the bolt throw length to match their preferences or specific shooting applications.

The bolt action firearm may combine the advantages of a front-locking system with the lower cost and reduced recoil of rimfire ammunition. This combination may provide a platform suitable for training, competition, and recreational shooting that closely mimics the feel and operation of larger centerfire rifles.

FIG. 1 illustrates a perspective view of a firearm 100 configured for rimfire cartridges with operational characteristics that simulate those of a centerfire rifle. The firearm 100 may include a barrel 102 extending from a receiver 106. A bolt assembly 104 may be housed within the receiver 106 and may operate to load and extract cartridges from a magazine 108. The magazine 108 may be configured to feed rimfire cartridges and may be positioned forward of a grip 110, which may be surrounded by a trigger guard 112. A stock 114 may extend rearward from the receiver 106, providing a support structure for the firearm 100.

In some cases, the barrel 102 may be coupled to the receiver 106. The bolt assembly 104 may be configured to operate within the receiver 106, allowing for the loading, firing, and extraction of rimfire cartridges. The combination of the receiver 106, barrel 102, bolt assembly 104, and magazine 108 may form the core functional components of the bolt action rimfire firearm 100.

The firearm 100 may be designed to simulate the operational characteristics of a centerfire rifle while being adapted for rimfire ammunition. This may be achieved through the specific configuration and interaction of the bolt assembly 104 with the receiver 106 and magazine 108. The dimensions and arrangement of these components may be tailored to accommodate rimfire cartridges while maintaining a form factor and operational feel similar to that of a centerfire rifle.

FIGS. 2A, 2B, and 2C illustrate various views of a bolt assembly 104 and a magazine 108 configured for use in a bolt action firearm. FIG. 2A shows a side view, FIG. 2B shows an isometric view, and FIG. 2C shows a bottom view of the bolt assembly 104 with the magazine 108 removed.

The bolt assembly 104 may be configured to operate within a receiver 106. In some cases, the bolt assembly 104 may include a bolt body and a bolt head coupled to the bolt body. The bolt assembly 104 may further include a bolt handle 116 that extends laterally from the side of the bolt assembly 104, allowing for manual operation of the bolt.

The magazine 108 may be positioned below the bolt assembly 104 and may be designed to feed rimfire cartridges into the firearm. In some cases, the magazine 108 may have feed lips positioned to interface with a clearance machined into a side of the bolt head during operation of the bolt assembly 104. This clearance may provide space for the feed lips of the magazine 108 during the advancing of the bolt assembly 104.

The configuration of the bolt assembly 104 and magazine 108 may allow for front-locking functionality in a rimfire design. In some cases, the bolt head may include the clearance machined into its side to provide space for the feed lips of the magazine 108 during operation of the bolt assembly 104. This design may enable proper feeding of ammunition while maintaining the necessary clearance for the operation of bolt assembly 104 in a front-locking configuration.

The relationship between the bolt assembly 104, receiver 106, and magazine 108 may be designed to accommodate the unique challenges of implementing a front-locking system in a rimfire firearm. The clearance in the bolt head and the positioning of the magazine feed lips may work together to ensure smooth operation and reliable feeding of rimfire cartridges while maintaining the benefits of a front-locking bolt design.

FIG. 3 illustrates an exploded view of the bolt assembly 104 for the firearm 100. The bolt assembly 104 may comprise several components arranged in a linear configuration to facilitate the front-locking mechanism and rimfire compatibility.

Starting from the rear of the bolt assembly 104, a bolt handle 116 may be connected to a bolt body 124. The bolt handle 116 may allow for manual operation of the bolt assembly 104 within the receiver 106. A hammer 118 extends through bolt body 124 and may be actuated by a trigger mechanism for actuating a firing pin 122.

A bolt body 124 may may include mounting features for other assembly elements. In some cases, the bolt body 124 may be shortened compared to traditional designs to accommodate other components of the bolt assembly 104.

A retaining pin 126 and a cocking pin 132 may be positioned between the bolt body 124 and other components. These pins may help secure various parts of the bolt assembly 104 and facilitate the cocking and firing. For example, retaining pin 126 may retain bolt head 120 in bolt body 124 and support hammer 118.

The front portion of the bolt assembly 104 may include a bolt head 120. In some cases, the bolt head 120 may have a clearance 128 machined into a side of the bolt head 120. This clearance 128 may provide space for interaction with the magazine 108 feed lips during operation of the bolt assembly 104.

A firing pin 122 may be designed to fit within a slot defined by the bolt head 120. In some cases, the firing pin 122 may be a sheet metal component that rests in a slot on the top of the bolt head 120 or bolt head stem. This configuration may allow for easy removal and installation of the firing pin 122 for cleaning or maintenance purposes.

A front baffle 134 may fit over at least a portion of the bolt head 120 and provide guidance for the assembly’s movement. In some cases, the front baffle 134 may be longer than in traditional designs, allowing it to slide over and at least partially surround the bolt head 120. This configuration may contribute to the front-locking mechanism of the bolt assembly 104.

The entire bolt assembly 104 may be contained within a housing 130, which may provide structural support and guidance for the operating components. The housing 130 may interface with the receiver 106 to ensure proper alignment and function of the bolt assembly 104 within the firearm 100.

In some cases, the arrangement of these components may allow for proper interaction during operation, with the firing pin 122 positioned to strike the rimfire ammunition when activated by the hammer 118. The clearance 128 in the bolt head 120 may provide space for interaction with the magazine 108 system, facilitating smooth feeding of rimfire cartridges.

The configuration of the bolt assembly 104 components may contribute to the firearm’s ability to simulate the operational characteristics of a centerfire rifle while being adapted for use with rimfire ammunition. The front-locking design, achieved through the specific arrangement of the bolt head 120, front baffle 134, and other components, may offer potential improvements in accuracy and rigidity compared to traditional rear-locking rimfire rifle configurations.

FIG. 4 illustrates an exploded view of a bolt head assembly for the bolt action firearm. The bolt head assembly may include a bolt head 120, a firing pin 122, and a clearance 128 machined into a side of the bolt head 120.

In some cases, the clearance 128 may be designed to provide space for the feed lips of the magazine during operation of the bolt assembly. The clearance 128 may allow for proper interaction between the bolt head 120 and the magazine feed lips, enabling smooth feeding of rimfire cartridges.

The bolt head assembly may further include an extractor mechanism and an ejector mechanism. The extractor mechanism may comprise an extractor 136, an extractor spring 138, and an extractor pin 140. In some cases, the extractor mechanism may be coupled to the bolt head 120. The extractor 136 may be configured to grip the rim of a cartridge case during the extraction process. The extractor spring 138 may provide tension to the extractor 136, ensuring proper engagement with the cartridge case. The extractor pin 140 may secure the extractor 136 and extractor spring 138 to the bolt head 120.

Similarly, the ejector mechanism may include an ejector 142, an ejector spring 144, and an ejector pin 146. The ejector mechanism may also be coupled to the bolt head 120. The ejector 142 may be designed to push the extracted cartridge case out of the firearm when the bolt assembly is fully retracted. The ejector spring 144 may provide the necessary force for the ejector 142 to perform its function. The ejector pin 146 may secure the ejector 142 and ejector spring 144 to the bolt head 120.

In some cases, the extractor mechanism and ejector mechanism may work in conjunction to ensure proper extraction and ejection of spent cartridge cases from the firearm. The positioning of these mechanisms on the bolt head 120 may allow for efficient operation during the cycling of the bolt assembly.

The firing pin 122 may be configured to extend through the bolt head 120. In some cases, the firing pin 122 may be actuated by hammer 118 to strike the rim of a rimfire cartridge, initiating the firing sequence.

The combination of the clearance 128, extractor mechanism, and ejector mechanism on the bolt head 120 may contribute to the reliable operation of the bolt action firearm, particularly in its adaptation for rimfire cartridges while maintaining a front-locking bolt design.

FIG. 5 illustrates a perspective view of the magazine 108 configured for use in the firearm 100. The magazine 108 may be designed to feed rimfire cartridges into the firearm 100. In some cases, the magazine 108 may follow an Accuracy International Chassis System (AICS) pattern, which may provide compatibility with existing firearm platforms and accessories.

The magazine 108 may include magazine feed lips 148 positioned at the top portion of the magazine 108. The magazine feed lips 148 may be configured to guide and retain rimfire cartridges within the magazine 108. In some cases, the magazine feed lips 148 may be designed to interface with the clearance 128 machined into the side of the bolt head 120 during operation of the bolt assembly 104.

The AICS pattern design of the magazine 108 may offer several advantages in the context of this rimfire firearm 100. In some cases, the AICS pattern may allow for compatibility with existing centerfire rifle components and accessories. This compatibility may provide manufacturing advantages and allow for greater flexibility in firearm customization.

The magazine 108 may be designed to work in conjunction with the bolt assembly 104 to ensure reliable feeding of rimfire cartridges. In some cases, the specific configuration of the magazine feed lips 148 may be tailored to accommodate the unique challenges of implementing a front-locking bolt system in a rimfire firearm 100. The magazine feed lips 148 may be positioned to allow proper interaction with the clearance 128 in the bolt head 120, facilitating smooth operation of the bolt assembly 104 while maintaining reliable cartridge feeding.

In some cases, the magazine 108 may be positioned forward of the grip 110 of the firearm 100. This positioning may contribute to the overall balance and ergonomics of the firearm 100, potentially enhancing user comfort and control during operation.

The design of the magazine 108 and its integration with the bolt assembly 104 may contribute to the firearm’s ability to simulate the operational characteristics of a centerfire rifle while being adapted for use with rimfire ammunition. The AICS pattern and specific configuration of the magazine feed lips 148 may work together to ensure reliable feeding and extraction of rimfire cartridges in a front-locking bolt action design.

FIG. 6 illustrates a perspective view of the bolt assembly 104 in a locking position, showing the interaction between the bolt head 120 and magazine feed lips 148. The bolt head 120 may extend horizontally and feature an elongated cylindrical shape with specific structural features. In some cases, the magazine feed lips 148 may be positioned below the bolt head 120.

The bolt head 120 may be designed with a specific clearance 128 to accommodate the magazine feed lips 148 during the locking operation of the bolt assembly 104. In some cases, the clearance 128 may be machined into a side of the bolt head 120. This clearance 128 may provide space for the magazine feed lips 148 to properly interface with the bolt head 120 during operation.

The spatial relationship between the bolt head 120 and the magazine feed lips 148 may be critical for the proper functioning of the firearm 100. In some cases, the clearance 128 in the bolt head 120 may allow the bolt assembly 104 to move smoothly into the locking position without interfering with the magazine feed lips 148. This configuration may enable reliable feeding of rimfire cartridges from the magazine 108 into the chamber of the firearm 100.

The design of the bolt head 120 with the clearance 128 may address the unique challenges of implementing a front-locking system in a rimfire firearm. In some cases, the clearance 128 may allow for proper interaction between the bolt assembly 104 and the magazine 108 while maintaining the benefits of a front-locking bolt design. This configuration may contribute to the firearm’s ability to simulate the operational characteristics of a centerfire rifle while being adapted for use with rimfire ammunition.

FIG. 7 illustrates a cross-sectional view of the bolt assembly 104 for the firearm 100, revealing the internal structure and components. The bolt assembly 104 may include a two-piece firing pin design that contributes to the firearm’s functionality and adaptability for rimfire cartridges.

In some cases, the bolt assembly 104 may comprise a bolt body 124 positioned at the rear portion of the assembly. The bolt body 124 may house various components of the firing mechanism, including a hammer 118. The hammer 118 may be positioned in a rear portion of the bolt body 124 and may be configured to actuate the firing pin 122.

The firing pin assembly of the bolt assembly 104 may include two separate pieces: the hammer 118 and the firing pin 122. This two-piece design may allow for a more compact bolt assembly while maintaining the necessary force for reliable ignition of rimfire cartridges. In some cases, the hammer 118 may be released from a sear mechanism (not shown) to strike the rear portion of the firing pin 122.

The bolt head 120 may be coupled to the front portion of the bolt body 124. In some cases, the bolt head 120 may include a channel or slot for accommodating the firing pin 122. The firing pin 122 may be positioned within this channel in the bolt head 120, extending from the rear of the bolt head 120 to the front face where the firing pin 122 may contact the rim of a cartridge.

A retaining pin 126 may be included in the bolt assembly 104 to secure various components in place. In some cases, the retaining pin 126 may help maintain the proper positioning of the firing pin 122 within the bolt head 120 and properly align hammer 118 with firing pin 122.

The two-piece firing pin design may offer several advantages for the bolt action rimfire firearm 100. In some cases, this configuration may allow for easier disassembly and cleaning of the bolt assembly 104. The firing pin 122 may be removable from the bolt assembly 104 when the front baffle 134 is rotated 180 degrees relative to the bolt head 120. This feature may facilitate maintenance and replacement of the firing pin 122 if necessary.

The separation of the hammer 118 and firing pin 122 may also contribute to the front-locking design of the bolt assembly 104. By positioning the hammer 118 in the rear portion of the bolt body 124 and the firing pin 122 in the bolt head 120, the bolt assembly 104 may achieve a more balanced weight distribution and potentially improved lock-up at the front of the receiver 106.

In some cases, the clearance 128 machined into the side of the bolt head 120 may be visible in the cross-sectional view. This clearance 128 may provide space for the magazine feed lips 148 during operation of the bolt assembly 104, ensuring smooth feeding of rimfire cartridges.

The internal structure of the bolt assembly 104, including the two-piece firing pin design, may contribute to the firearm’s ability to simulate the operational characteristics of a centerfire rifle while being adapted for use with rimfire ammunition. The specific arrangement of components within the bolt assembly 104 may allow for reliable ignition of rimfire cartridges while maintaining the benefits of a front-locking bolt design.

FIG. 8 illustrates a perspective view of the bolt assembly 104 with a translucent representation of components. The bolt assembly 104 may include the bolt head 120 and the front baffle 134, where the front baffle 134 may be depicted as translucent to reveal the internal structure and relationship between the components.

In some cases, the front baffle 134 may extend over and at least partially surround a portion of the bolt head 120, creating a cylindrical assembly. The front baffle 134 may appear as a hollow cylindrical component that interfaces with the bolt head 120 to form part of the bolt assembly’s structure.

The front baffle 134 may include an internal diameter that extends more than 180 degrees to secure the front baffle 134 to the bolt head 120. In some cases, the internal diameter of the front baffle 134 may be minimally or sufficiently greater than 180 degrees to allow the front baffle 134 to be secured to the diameter of the bolt head 120 while still permitting removal when rotated to a specific angle.

The bolt head 120 may include flats positioned at 45 degrees from center. In some cases, these flats may allow removal of the front baffle 134 when aligned with a specific angle. This configuration may enable the front baffle 134 to be removable from the bolt head 120 when rotated to a specific angle relative to the bolt head 120.

The angular position of the front baffle 134 relative to the bolt head 120 may be opposite the normal rotation of the bolt assembly 104. In some cases, this configuration may contribute to the security of the front baffle 134 during normal operation while still allowing for removal when desired.

The bolt head 120 may include a stem with two flats on it 45 degrees from center. In some cases, these flats may allow the front baffle 134 to be removed if the front baffle 134 is rotated to a precise angle. This design may facilitate easy removal and installation of the front baffle 134 for maintenance or configuration changes.

The configuration of the front baffle 134 and its relationship to the bolt head 120 may contribute to the bolt assembly’s functionality and adaptability. In some cases, this design may allow for easy disassembly and reassembly of the bolt assembly 104, potentially facilitating maintenance and cleaning. The ability to remove and potentially reverse the front baffle 134 may also allow for adjustments to the bolt stroke length, providing versatility in the firearm’s operation.

FIG. 9 illustrates a perspective view of a bolt assembly 204 showing a short stroke configuration. The bolt assembly 204 may include a bolt body 224 at the rear portion, a short stroke baffle 234 in the middle portion, and a bolt head 220 at the front portion.

In some cases, the short stroke baffle 234 may include a rearward stop surface, indicated by a blue highlight in FIG. 9. This rearward stop surface may be configured to limit the rearward travel of the bolt assembly 204 within the receiver of the firearm. The rearward stop surface may interact with a corresponding surface within the receiver to define the maximum rearward position of the bolt assembly 204 during operation.

The short stroke configuration of the bolt assembly 204 may be characterized by a reduced range of rearward motion compared to a long stroke configuration. In some cases, this limited rearward travel may result in faster cycling of the bolt assembly 204, as the bolt handle may need to be pulled back a shorter distance to extract a spent cartridge and chamber a new round from the magazine.

The short stroke baffle 234 may include a short stroke baffle portion that includes the rearward stop surface. This short stroke baffle portion may be specifically configured to limit the rearward travel of the bolt assembly 204. In some cases, the position of the rearward stop surface on the short stroke baffle 234 may determine the extent of the bolt assembly’s rearward movement.

The interaction between the rearward stop surface of the short stroke baffle 234 and the receiver may impact the overall bolt movement and cycling characteristics of the firearm. In some cases, this configuration may allow for quicker follow-up shots and potentially improved shooting speed in certain applications.

The bolt body 224 and bolt head 220 may work in conjunction with the short stroke baffle 234 to facilitate the short stroke operation. The bolt head 220 may include features such as the clearance for magazine feed lips, while the bolt body 224 may house components of the firing mechanism, such as the hammer and firing pin.

In some cases, the short stroke configuration may be particularly beneficial for rimfire cartridges, which typically require less bolt travel for reliable extraction and feeding compared to larger centerfire cartridges. This configuration may contribute to the firearm’s ability to simulate the operational characteristics of a centerfire rifle while being optimized for use with rimfire ammunition.

FIG. 10 illustrates a perspective view of a bolt assembly 304 showing a rearward stop configuration with a long stroke baffle. The bolt assembly 304 may include a bolt body 324 positioned at the rear portion, a long stroke baffle 334 in the middle section, and a bolt head 320 located at the front portion.

In some cases, the long stroke baffle 334 may extend over and surround portions of both the bolt body 324 and the bolt head 320, creating a unified assembly structure. The long stroke baffle 334 may include a blue-highlighted surface that indicates the rearward stop position. This rearward stop may limit the bolt assembly’s rearward travel during operation.

The long stroke configuration of the bolt assembly 304 may allow for extended rearward movement compared to a short stroke configuration. In some cases, the front baffle may include a long stroke baffle portion configured to allow extended rearward movement of the bolt assembly 304. This extended rearward movement may provide certain advantages in the operation of the firearm.

The long stroke configuration may offer a longer bolt throw, which may simulate the feel of operating a larger caliber firearm. In some cases, this longer bolt throw may provide improved extraction and ejection of spent cartridges, particularly in adverse conditions or with fouled chambers. The extended rearward movement may also allow for a longer loading stroke, potentially improving the reliability of feeding cartridges from the magazine.

Conversely, a short stroke configuration may offer advantages in terms of faster cycling times and potentially improved accuracy due to less movement of the bolt assembly. In some cases, the short stroke configuration may be preferred for rapid follow-up shots or in competitive shooting scenarios where speed is crucial.

The ability to configure the bolt assembly 304 for either long stroke or short stroke operation may provide versatility to the firearm. In some cases, this adaptability may allow users to customize the bolt throw length to match their preferences or specific shooting applications, enhancing the overall utility of the firearm.

FIG. 11 illustrates a perspective view of a bolt assembly 404 with a modular baffle system. The bolt assembly 404 may include a modular baffle 434 that incorporates a baffle block 435. In some cases, the modular baffle 434 may be designed to allow for easy switching between long and short stroke configurations without requiring complete disassembly of the bolt assembly 404.

The modular baffle 434 may be configured to provide at least two different bolt stroke lengths. In some cases, the modular baffle 434 may be reversible to provide both a long stroke configuration and a short stroke configuration. This reversibility may allow users to adjust the bolt throw length to match their preferences or specific shooting applications.

The baffle block 435 may be secured to the modular baffle 434 using a baffle screw 437. In some cases, the baffle screw 437 may be assembled from the front of the modular baffle 434. This configuration may allow for easy removal and installation of the baffle block 435 without requiring complete disassembly of the bolt assembly 404.

The ‘short’ stroke configuration of the bolt assembly 404 may be achieved by the addition of the baffle block 435. When the baffle block 435 is installed, it may limit the rearward travel of the bolt assembly 404 within the receiver of the firearm. Conversely, removing the baffle block 435 may allow for extended rearward movement, resulting in a long stroke configuration. Additionally, or alternatively, baffle screw 437 may be used to adjust the position of baffle block 435 to adjust the stroke length.

In some cases, the modular baffle system may provide flexibility in adjusting the bolt stroke length without the need for additional parts or tools. Users may be able to switch between long and short stroke configurations by simply removing, installing, or adjusting the baffle block 435 using the baffle screw 437.

The modular baffle system may contribute to the firearm’s adaptability for different shooting scenarios. For example, the short stroke configuration may allow for faster cycling of the bolt assembly 404, which may be beneficial in certain competitive shooting events. The long stroke configuration, on the other hand, may provide a feel more similar to that of a centerfire rifle, which may be desirable for training purposes or for shooters accustomed to larger caliber firearms.

FIGS. 12 through 16 illustrate a reversible baffle design for the bolt assembly 504 of the firearm 100. This design allows for easy adjustment between long and short stroke configurations without the need for additional parts or tools.

FIG. 12 shows the bolt assembly 504 in an unlocked position with a long stroke configuration. The bolt assembly 504 may include a bolt head 520 and a front baffle 534. In some cases, the front baffle 534 may include a long stroke baffle portion 535 that extends along the length of the bolt head 520. The long stroke baffle portion 535 may be positioned on the lower portion of the front baffle 534, determining the rearward travel distance of the bolt assembly 504.

FIG. 13 illustrates a front perspective view of the bolt assembly 504 with the front baffle 534 partially removed at a 45-degree angle. In some cases, the front baffle 534 may be removed from the bolt head 520 by rotating the front baffle 534 to a specific angle relative to the bolt head 520. This specific angle may allow the front baffle 534 to clear internal features of the bolt head 520, facilitating removal without the need for tools.

FIG. 14 provides a rear perspective view of the bolt assembly 504 with the front baffle 534 partially removed at a 45-degree angle. The bolt head 520 may include flats positioned at 45 degrees from center that allow the front baffle 534 to be removed when properly aligned. In some cases, the front baffle 534 may have an internal diameter that extends more than 180 degrees to secure the front baffle 534 to the bolt head 520 during normal operation.

FIG. 15 shows the bolt assembly 504 in a locked position with the long stroke configuration. The front baffle 534 may be fully seated on the bolt head 520, with the long stroke baffle portion 535 positioned to allow extended rearward movement of the bolt assembly 504.

FIG. 16 illustrates the bolt assembly 504 in a short stroke configuration. In some cases, the orientation of the front baffle 534 may be reversed to change between the long stroke configuration and a short stroke configuration. The front baffle 534 may include a short stroke baffle portion 537, which may be configured to limit the rearward travel of the bolt assembly 504 when the front baffle 534 is installed in the reversed orientation.

In some cases, the front baffle 534 may be reattached to the bolt head 520 to change between the long stroke configuration and the short stroke configuration. This may be accomplished by removing the front baffle 534, rotating the front baffle 534 180 degrees, and then reattaching the front baffle 534 to the bolt head 520. The specific angle required for removal and reattachment may ensure that the front baffle 534 remains securely in place during normal operation of the bolt assembly 504.

The reversible baffle design may allow users to easily customize the bolt stroke length of the firearm 100 without the need for additional parts or specialized tools. In some cases, this feature may enhance the versatility of the firearm 100, allowing it to be adapted for different shooting applications or user preferences.

In some cases, the bolt action rimfire firearm may operate through a series of coordinated movements and interactions between various components. The operational sequence may involve the firing of a cartridge, extraction and ejection of the spent case, and chambering of a new round.

The firing sequence may begin with the bolt assembly in a locked position. In some cases, the bolt assembly may be rotated to a locked position, where locking may occur at a front portion of a receiver of the firearm. This front-locking mechanism may provide a secure and stable platform for firing.

When the trigger is pulled, the firing pin may be released to strike the rim of the cartridge, initiating the firing sequence. The expanding gases from the fired cartridge may push the bullet down the barrel while simultaneously pushing back against the bolt face.

After firing, the bolt assembly may be rotated to an unlocked position. In some cases, this rotation may disengage the locking lugs of the bolt head from corresponding recesses in the receiver. Once unlocked, the bolt assembly may be retracted to extract a spent cartridge case. The extractor mechanism may grip the rim of the spent case, pulling it from the chamber as the bolt assembly moves rearward.

As the bolt assembly reaches its rearmost position, the ejector mechanism may activate. In some cases, the ejector may push against the base of the spent cartridge case, causing it to pivot around the extractor and eject from the firearm through the ejection port.

To chamber a new round, the bolt assembly may be advanced forward. In some cases, the bolt assembly may be advanced to chamber a new cartridge from a magazine. As the bolt moves forward, the bolt face may strip a new cartridge from the top of the magazine and guide it into the chamber. The clearance machined into the side of the bolt head may provide space for the magazine feed lips during this process, ensuring smooth feeding of the cartridge.

Once the new cartridge is fully chambered, the bolt assembly may be rotated back to the locked position, ready for the next firing cycle.

In some cases, the firearm may allow for switching between long and short stroke configurations. This process may involve adjusting the front baffle of the bolt assembly. For a long stroke configuration, the front baffle may be positioned or oriented to allow extended rearward movement of the bolt assembly. Conversely, for a short stroke configuration, the front baffle may be adjusted to limit the rearward travel of the bolt assembly.

The ability to switch between long and short stroke configurations may provide versatility in the firearm’s operation. In some cases, the long stroke configuration may offer improved extraction and ejection, particularly in adverse conditions. The short stroke configuration may allow for faster cycling of the bolt assembly, which may be beneficial in certain shooting scenarios.

The operational interaction of these components may contribute to the firearm’s ability to simulate the characteristics of a centerfire rifle while being adapted for use with rimfire ammunition. The front-locking mechanism, combined with the adjustable stroke length, may provide a platform that offers both the reliability of a centerfire design and the adaptability needed for various rimfire applications.

The following clauses illustrate example subject matter described herein.

Clause 1. A bolt action firearm, comprising: a receiver; a barrel coupled to the receiver; a bolt assembly configured to operate within the receiver, the bolt assembly including: a bolt body; a bolt head coupled to the bolt body and having a clearance machined into a side of the bolt head; a front baffle configured to at least partially surround the bolt head, the front baffle being removable from the bolt head when rotated to a specific angle relative to the bolt head; and a firing pin assembly including a hammer and a separate firing pin, wherein the hammer is configured to actuate the firing pin; and a magazine configured to feed rimfire cartridges, the magazine having feed lips positioned to interface with the clearance of the bolt head during operation of the bolt assembly.

Clause 2. The bolt action firearm of clause 1, wherein the front baffle is reversible to provide both a long stroke configuration and a short stroke configuration.

Clause 3. The bolt action firearm of clause 2, wherein the front baffle comprises: a long stroke baffle portion configured to allow extended rearward movement of the bolt assembly; and a short stroke baffle portion configured to limit rearward travel of the bolt assembly.

Clause 4. The bolt action firearm of clause 1, wherein the bolt head comprises flats positioned at 45 degrees from center to allow removal of the front baffle when aligned with the specific angle.

Clause 5. The bolt action firearm of clause 1, wherein the firing pin is removable from the bolt assembly when the front baffle is rotated 180 degrees.

Clause 6. The bolt action firearm of clause 1, further comprising: an extractor mechanism including an extractor, an extractor spring, and an extractor pin; and an ejector mechanism including an ejector, an ejector spring, and an ejector pin.

Clause 7. The bolt action firearm of clause 6, wherein the extractor mechanism and ejector mechanism are coupled to the bolt head.

Clause 8. A method of operating a bolt action rimfire firearm, comprising: providing a bolt assembly including a bolt body, a bolt head coupled to the bolt body, and a front baffle at least partially surrounding the bolt head; rotating the bolt assembly to an unlocked position; retracting the bolt assembly to extract a spent cartridge case; advancing the bolt assembly to chamber a new cartridge from a magazine, wherein the bolt head includes a clearance machined into a side to provide space for feed lips of the magazine during the advancing; and rotating the bolt assembly to a locked position, wherein locking occurs at a front portion of a receiver of the firearm.

Clause 9. The method of clause 8, further comprising: removing the front baffle from the bolt head by rotating the front baffle to a specific angle relative to the bolt head.

Clause 10. The method of clause 9, further comprising: reversing the orientation of the front baffle; and reattaching the front baffle to the bolt head to change between a long stroke configuration and a short stroke configuration.

Clause 11. The method of clause 10, wherein: the long stroke configuration allows extended rearward movement of the bolt assembly; and the short stroke configuration limits rearward travel of the bolt assembly.

Clause 12. The method of clause 8, wherein providing the bolt assembly further comprises: providing a firing pin assembly including a hammer and a separate firing pin, wherein the hammer is configured to actuate the firing pin.

Clause 13. The method of clause 12, further comprising: removing the firing pin from the bolt assembly when the front baffle is rotated 180 degrees relative to the bolt head.

Clause 14. The method of clause 8, wherein the bolt head comprises flats positioned at 45 degrees from center to allow removal of the front baffle when aligned with the specific angle.

Clause 15. A bolt assembly for a rimfire firearm, comprising: a bolt body; a bolt head coupled to the bolt body, the bolt head including a clearance machined into a side of the bolt head; a front baffle configured to at least partially surround the bolt head, the front baffle being reversible to provide at least two different bolt stroke lengths; and a two-piece firing pin assembly including a hammer positioned in a rear portion of the bolt assembly and a separate firing pin positioned in the bolt head, wherein the hammer is configured to actuate the firing pin upon release.

Clause 16. The bolt assembly of clause 15, wherein the front baffle is removable from the bolt head when rotated to a specific angle relative to the bolt head.

Clause 17. The bolt assembly of clause 16, wherein the bolt head comprises flats positioned at 45 degrees from center to allow removal of the front baffle when aligned with the specific angle.

Clause 18. The bolt assembly of clause 15, wherein the front baffle comprises: a long stroke baffle portion configured to allow extended rearward movement of the bolt assembly; and a short stroke baffle portion configured to limit rearward travel of the bolt assembly.

Clause 19. The bolt assembly of clause 15, further comprising: an extractor mechanism including an extractor, an extractor spring, and an extractor pin; and an ejector mechanism including an ejector, an ejector spring, and an ejector pin.

Clause 20. The bolt assembly of clause 19, wherein the extractor mechanism and ejector mechanism are coupled to the bolt head, and wherein the firing pin is removable from the bolt assembly when the front baffle is rotated 180 degrees relative to the bolt head.

Clause 21. A bolt action firearm, comprising: a receiver; a barrel coupled to the receiver; a bolt assembly configured to operate within the receiver, the bolt assembly including: a bolt body; a bolt head coupled to the bolt body; a front baffle at least partially surrounding the bolt head; and a firing pin assembly; and a magazine configured to feed rimfire cartridges, wherein the bolt head includes a clearance machined into a side to provide space for feed lips of the magazine during operation of the bolt assembly.

Clause 22. The bolt action firearm of clause 21, wherein the firing pin assembly comprises a hammer and a separate firing pin, the hammer being configured to actuate the firing pin.

Clause 23. The bolt action firearm of clause 21, wherein the front baffle includes a rearward stop surface configured to limit rearward travel of the bolt assembly.

Clause 24. The bolt action firearm of clause 21, further comprising: an extractor mechanism coupled to the bolt head; and an ejector mechanism coupled to the bolt head.

Clause 25. A method of assembling a bolt action rimfire firearm, comprising: coupling a bolt head to a bolt body; positioning a front baffle to at least partially surround the bolt head; installing a firing pin assembly within the bolt body and bolt head; and inserting the assembled bolt body, bolt head, front baffle, and firing pin assembly into a receiver of the firearm.

Clause 26. The method of clause 25, further comprising: attaching an extractor mechanism to the bolt head; and attaching an ejector mechanism to the bolt head.

Clause 27. The method of clause 25, wherein installing the firing pin assembly comprises: positioning a hammer in a rear portion of the bolt body; and positioning a separate firing pin in the bolt head.

Clause 28. A bolt assembly for a rimfire firearm, comprising: a bolt body; a bolt head coupled to the bolt body; a front baffle at least partially surrounding the bolt head; and a firing pin assembly, wherein the bolt head includes a clearance machined into a side of the bolt head configured to provide space for magazine feed lips during operation of the bolt assembly.

Clause 29. The bolt assembly of clause 28, wherein the front baffle includes an internal diameter that extends more than 180 degrees to secure the front baffle to the bolt head.

Clause 30. The bolt assembly of clause 28, further comprising: an extractor mechanism coupled to the bolt head; and an ejector mechanism coupled to the bolt head.

A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the disclosure. Accordingly, other implementations are within the scope of the following claims.

Claims

1. A bolt action firearm, comprising:

a receiver;

a barrel coupled to the receiver;

a bolt assembly configured to operate within the receiver, the bolt assembly including: a bolt body; a bolt head coupled to the bolt body and having a clearance machined into a side of the bolt head; a front baffle configured to at least partially surround the bolt head, the front baffle being removable from the bolt head when rotated to a specific angle relative to the bolt head; and a firing pin assembly including a hammer and a separate firing pin, wherein the hammer is configured to actuate the firing pin; and a magazine configured to feed rimfire cartridges, the magazine having feed lips positioned to interface with the clearance of the bolt head during operation of the bolt assembly.

2. The bolt action firearm of claim 1, wherein the front baffle is reversible to provide both a long stroke configuration and a short stroke configuration.

3. The bolt action firearm of claim 2, wherein the front baffle comprises:

a long stroke baffle portion configured to allow extended rearward movement of the bolt assembly; and

a short stroke baffle portion configured to limit rearward travel of the bolt assembly.

4. The bolt action firearm of claim 1, wherein the bolt head comprises flats positioned at 45 degrees from center to allow removal of the front baffle when aligned with the specific angle.

5. The bolt action firearm of claim 1, wherein the firing pin is removable from the bolt assembly when the front baffle is rotated 180 degrees.

6. The bolt action firearm of claim 1, further comprising:

an extractor mechanism including an extractor, an extractor spring, and an extractor pin; and

an ejector mechanism including an ejector, an ejector spring, and an ejector pin.

7. The bolt action firearm of claim 6, wherein the extractor mechanism and ejector mechanism are coupled to the bolt head.

8. A method of operating a bolt action rimfire firearm, comprising:

providing a bolt assembly including a bolt body, a bolt head coupled to the bolt body, and a front baffle at least partially surrounding the bolt head;

rotating the bolt assembly to an unlocked position;

retracting the bolt assembly to extract a spent cartridge case;

advancing the bolt assembly to chamber a new cartridge from a magazine, wherein the bolt head includes a clearance machined into a side to provide space for feed lips of the magazine during the advancing; and

rotating the bolt assembly to a locked position, wherein locking occurs at a front portion of a receiver of the firearm.

9. The method of claim 8, further comprising:

removing the front baffle from the bolt head by rotating the front baffle to a specific angle relative to the bolt head.

10. The method of claim 9, further comprising:

reversing an orientation of the front baffle; and

reattaching the front baffle to the bolt head to change between a long stroke configuration and a short stroke configuration.

11. The method of claim 10, wherein:

the long stroke configuration allows extended rearward movement of the bolt assembly; and

the short stroke configuration limits rearward travel of the bolt assembly.

12. The method of claim 8, wherein providing the bolt assembly further comprises:

providing a firing pin assembly including a hammer and a separate firing pin, wherein the hammer is configured to actuate the firing pin.

13. The method of claim 12, further comprising:

removing the firing pin from the bolt assembly when the front baffle is rotated 180 degrees relative to the bolt head.

14. The method of claim 8, wherein the bolt head comprises flats positioned at 45 degrees from center to allow removal of the front baffle when aligned with a specific angle.

15. A bolt assembly for a rimfire firearm, comprising:

a bolt body;

a bolt head coupled to the bolt body, the bolt head including a clearance machined into a side of the bolt head;

a front baffle configured to at least partially surround the bolt head, the front baffle being reversible to provide at least two different bolt stroke lengths; and

a two-piece firing pin assembly including a hammer positioned in a rear portion of the bolt assembly and a separate firing pin positioned in the bolt head, wherein the hammer is configured to actuate the firing pin upon release.

16. The bolt assembly of claim 15, wherein the front baffle is removable from the bolt head when rotated to a specific angle relative to the bolt head.

17. The bolt assembly of claim 16, wherein the bolt head comprises flats positioned at 45 degrees from center to allow removal of the front baffle when aligned with the specific angle.

18. The bolt assembly of claim 15, wherein the front baffle comprises:

a long stroke baffle portion configured to allow extended rearward movement of the bolt assembly; and

a short stroke baffle portion configured to limit rearward travel of the bolt assembly.

19. The bolt assembly of claim 15, further comprising:

an extractor mechanism including an extractor, an extractor spring, and an extractor pin; and

an ejector mechanism including an ejector, an ejector spring, and an ejector pin.

20. The bolt assembly of claim 19, wherein the extractor mechanism and ejector mechanism are coupled to the bolt head, and wherein the firing pin is removable from the bolt assembly when the front baffle is rotated 180 degrees relative to the bolt head.