Modular Rifle Stock
The buttstock assembly uses a modular design including interchangeable end attachments and sling strap connectors. The interchangeable end attachments allow the buttstock to have different toe heights and configurations for different shooting applications. The interchangeable strap connectors allow the use of either quick-disconnect style sling swivels or more traditional fixed strap loops as desired. The buttstock assembly also uses a “trigger” style locking mechanism to selectively position and lock the buttstock along the length of the extension tube to adjust the overall length of pull of the weapon.
This is a divisional application of pending U.S. patent application Ser. No. 16/746,819 filed on Jan. 18, 2020, which claims the benefit of U.S. Provisional Application No. 62/794,513 filed Jan. 10, 2019.
This invention relates to adjustable rifle buttstocks used on AR-15 style rifles, and in particular, an adjustable buttstock assembly having modular attachments to accommodate varying toe heights and sling strap connections.BACKGROUND AND SUMMARY OF THE INVENTION
Adjustable buttstocks mountable to the receiver extension tubes (“buffer tubes”) of AR-15/M-16 style rifles and similar shoulder fired weapons are well known in the art. Typically, adjustable buttstocks have locking mechanisms that allow the stock to be selectively positioned along the length of the extension tube to effectively adjust the weapons overall “length of pull.” Certain adjustable buttstock designs have incorporated storage compartments, sling strap connectors of various types, and interchangeable buttplates; however, heretofore, the height of the toe of the buttstock, i.e. the over height of the buttstock measured from its end has remained fixed. The height of the toe of the buttstock often interferes with the proper presentation of the weapon on target, particular when the shooter wears ballistic armor plates. The thick armor plates covering the shooter's chest generally prevent the toe of the buttstock from nesting into the shooter's shoulder. This forces the shooter to rest the buttstock against the front of the plate creating a less stable presentation or atop the plate raising the shooter's body position and normal line of sight on the weapon.
The buttstock assembly of this invention uses a modular design including interchangeable end attachments and sling strap connectors. The interchangeable end attachments allow for the stock to have different toe heights and configurations for different shooting applications. The interchangeable strap connectors allow the use of either quick-disconnect style sling swivels or more traditional fixed strap loops as desired. The buttstock assembly also uses a “trigger” style locking mechanism to selectively position and lock the buttstock along the length of the extension tube to adjust the overall length of pull of the weapon. The modular design of the buttstock assembly of this invention provides more flexibility in configuring the buttstock of individual preference and application. The interchangeable end attachments, allow users to configure the buttstock to have a shorter “toe” height for use with plate carriers and similar body armor, or a conventional toe height for traditional applications.
The above described features and advantages, as well as others, will become more readily apparent to those of ordinary skill in the art by reference to the following detailed description and accompanying drawings.
The present invention may take form in various system and method components and arrangement of system and method components. The drawings are only for purposes of illustrating exemplary embodiments and are not to be construed as limiting the invention. The drawings illustrate the present invention, in which:
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration specific preferred embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and it is understood that other embodiments may be utilized and that logical, structural, mechanical, electrical, and chemical changes may be made without departing from the spirit or scope of the invention. To avoid detail not necessary to enable those skilled in the art to practice the invention, the description may omit certain information known to those skilled in the art. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims.
Referring now to the drawings,
Buttstock assembly 100 consists of a main stock body 110 having interchangeable end attachments 160 and 170, and interchangeable sling strap connectors 180 and 190. Buttstock assembly 100 uses a “trigger” style locking mechanism to selectively position and lock main stock body 110 along the length of extension tube 10 to adjust the overall length of pull of the weapon. Interchangeable end attachments 160 and 170 mount to the main stock body 110 and have “toe” sections of differing lengths and configurations. In addition, buttstock assembly 100 includes a modular design to accept different sling strap connectors, including a quick disconnect swivel 180 and a traditional strap loop connector 190.
Main stock body 110 is constructed from suitable polymer plastic and formed by two symmetrical halves 112A and 112B that are fused or bonded together. The proximal end of main stock body 110 has a longitudinal passage configured to shiftably receive the extension tube 10. The distal end of main stock body 110 terminates in a flat end wall 114. Main body 110 has symmetrical cheek weld 116 on either side that are spaced forward of end wall 114. A connector slot 117 is formed in the rear face of both cheek welds 116. The distal end of main stock body 110 also has a pair of connector bosses 118 extending laterally from either side. Each connector boss 118 has an axial connector bore 119. The bottom of main stock body 110 has a trigger guard 120 and a plunger housing 128.
The locking mechanism used to position and lock main body 110 in place along extension tube 10 includes a trigger 130, trigger bar 132 and plunger 138 disposed between body halves 112A and 112B. Trigger 130 is shiftably seated within a slot formed between halves 112A and 112B inside trigger guard 120. Trigger bar 132 is shiftably seated within a longitudinal channel 121 formed between body halves 112A and 112B. The distal end of trigger bar 132 is connected to the top of trigger 130 by a pair of screw fasteners 133. The proximal end of trigger bar 132 terminates in an angled clevis 134. Trigger bar 132 is urged forward by coil spring 136, which is seated into a spring channel 137 formed between body halves 112A and 112B. Plunger 138 is shiftably seated within a vertical plunger well 129 formed in plunger housing 128. Plunger 138 is operatively connected to trigger bar 132 by a connector pin 139, which extends through elongated slots 135 in clevis 134 and through a hole in the plunger. Movement of trigger bar 132 drives plunger 138 up and down within plunger well 129 by the engagement of pin 139 inside slot 135 of angled clevis 134. Plunger 138 travels vertically in plunger well 129 formed in main stock body 110 and is pushed into one of extension recesses 15 along rib 12 by means of a spring 136, which drives trigger bar 132 forward. Pressing trigger 130 rearward pulls trigger bar 132 rearward against the tension of spring 136.
In the locked position (
End attachments 160 and 170 are secured to main stock body 110 in the same manner by a toe hook 168, 178 and a screw fastener 127.
As shown in
It should be apparent from the foregoing that an invention having significant advantages has been provided. While the invention is shown in only a few of its forms, it is not just limited but is susceptible to various changes and modifications without departing from the spirit thereof. The embodiment of the present invention herein described and illustrated is not intended to be exhaustive or to limit the invention to the precise form disclosed. It is presented to explain the invention so that others skilled in the art might utilize its teachings. The embodiment of the present invention may be modified within the scope of the following claims.
1. A modular buttstock assembly for a firearm comprising:
- a main stock body having a proximal end and a distal end thereof, the proximal end adapted to mount to the firearm, the main stock body also having a cheek weld spaced from the distal end; and
- one or more interchangeable sling strap connectors detachable to the distal end of the main stock body for affixing a sling strap to the main stock body.
2. The modular buttstock assembly of claim 1 wherein main stock body has a lateral opening adjacent the distal end for restrictively receiving part of the one or more interchangeable sling strap connectors.
3. The modular buttstock assembly of claim 1 wherein the main stock body also has a cheek weld slot formed in the cheek weld for receiving another part of the one or more interchangeable sling strap connectors.
4. The modular buttstock assembly of claim 3 wherein one of the one or more sling strap connectors is a fixed sling loop.
5. The modular buttstock assembly of claim 4 wherein the fixed sling loop includes a head part mountable to the main stock body within the lateral opening and a neck extension part mountable to the main stock body within the cheek weld slot.
6. The modular buttstock assembly of claim 2 wherein one of the one or more sling strap connectors is a quick-detach sling swivel mountable to the main stock body within the lateral opening.