Abstract: A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway to a piston chamber. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.

Abstract: A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway from the barrel provided by clusters of holes less than a specific size and on-center with the barrel axis. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.

Abstract: A trigger assembly having a user-adjustable actuation force. The trigger assembly includes a trigger and indexing pin that are rotatable about a pivot axis and mounted to a locking block of a firearm. A torsion spring bridges the indexing pin and the locking block. Rotation of the indexing pin in a first rotational direction increases the actuation force of the trigger assembly, while rotation of the indexing pin in a second, opposite rotational direction decreases the actuation force. The end user is able to adjust the actuation force of the trigger without procuring additional components and without requiring the services of a locksmith. A safety trigger has a lower pivot point on the trigger and provides a stop that prevents retraction of the trigger unless the safety trigger is retracted first.

Abstract: A reciprocating bolt assembly has delayed blowback and a firing pin block. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback.

Abstract: A modular system for adjusting the length of pull and drop of a long gun. The modular system enables a combination of any one of a plurality of comb portions with any one or more of a plurality of butt pad spacers for a versatile and robust system that provides a wide range of comb height and length of pull combinations. The system can be implemented by the user, avoiding costly gun fitters. The system provides these aspects in a sleek, streamlined way that does not mar the appearance of the long gun. The spacers for the length of pull adjustment include registration surfaces that provide a three-dimensional interface with the buttstock and comb portion for enhanced strength and stability of the assembly over that of conventional fit adjustment systems.

Abstract: A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway to a piston chamber. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.

Abstract: A trigger assembly having a user-adjustable actuation force. The trigger assembly includes a trigger and indexing pin that are rotatable about a pivot axis and mounted to a locking block of a firearm. A torsion spring bridges the indexing pin and the locking block. Rotation of the indexing pin in a first rotational direction increases the actuation force of the trigger assembly, while rotation of the indexing pin in a second, opposite rotational direction decreases the actuation force. The end user is able to adjust the actuation force of the trigger without procuring additional components and without requiring the services of a locksmith. A safety trigger has a lower pivot point on the trigger and provides a stop that prevents retraction of the trigger unless the safety trigger is retracted first.

Abstract: A reciprocating bolt assembly has delayed blowback and a firing pin block. Features prevent out-of-battery firing, when the bolt assembly is not fully engaged to the firing chamber or barrel face, a movable member within a bolt body functions as a blocking member that blocks the firing pin and prevents the firing pin from striking a cartridge. In embodiments, the firing pin has two stop portions that the movable member can engage depending on the cycle status of the firearm. A reverse cam mechanism associated with the firing pin blocking provides a resistance to and delays blowback.

Abstract: A modular system for adjusting the length of pull and drop of a long gun. The modular system enables a combination of any one of a plurality of comb portions with any one or more of a plurality of butt pad spacers for a versatile and robust system that provides a wide range of comb height and length of pull combinations. The system can be implemented by the user, avoiding costly gun fitters. The system provides these aspects in a sleek, streamlined way that does not mar the appearance of the long gun. The spacers for the length of pull adjustment include registration surfaces that provide a three-dimensional interface with the buttstock and comb portion for enhanced strength and stability of the assembly over that of conventional fit adjustment systems.

Abstract: An improved firearm. The improved firearm includes a barreled action; a stock; and a support located between the barreled action and the stock. In one preferred embodiment, the support includes a center support rail and a pair of side rails located parallel to the center support rail.

Abstract: A firearm barrel configured to attach to a muzzle device including a muzzle device bore and a tapered interior surface tapering from a first, wider portion at a proximal end of the muzzle device to a second, narrower portion away from the proximal end. The firearm barrel includes a barrel bore, a first, proximal end, a second, distal end, and a tapered exterior surface tapering from a first, wider portion to a second, narrower portion towards the distal end of the barrel, wherein the tapered exterior surface is configured to operably mate with the tapered interior surface of the muzzle device to optimize axial alignment of the barrel bore with the muzzle device bore.

Abstract: A semiautomatic shotgun comprising a receiver, a barrel, a forward gas block assembly attached to the barrel, a slider assembly rearward of the gas block assembly extending into the receiver. Upon firing a shotshell the explosive gases in the barrel are diverted through two ports into the gas block assembly, specifically into a pair of lateral pressure relief valves positioned on both sides of the barrel. The pressure relief valves further having a gas pathway to a piston chamber. A piston is forced rearwardly and engages a slider of the slider assembly that is linked to a breech block in the receiver. The breech block loads unfired shells and ejects the fired shells accomplishing the semiautomatic recycling. The dual pressure relief valves actuate to moderate and limit the gas pressure that enters the piston chamber when using shotshells of different power levels thereby providing consistency in the recycling operation.

Abstract: A firearm with a tool-less adjustable trigger pull. The adjustment may be facilitated with a thumb rotatable wheel for tool-less tension adjustment of a trigger tension spring. The rotatable wheel may be accessed by snapping a trigger guard away from a stock of the firearm. Accordingly, the force required to actuate the trigger can be adjusted to the user's preference without having to remove the trigger assembly from the stock, and without need for external tools or accessories.

Abstract: An improved firearm. The improved firearm includes a barreled action; a stock; and a support located between the barreled action and the stock. In one preferred embodiment, the support includes a center support rail and a pair of side rails located parallel to the center support rail. In another preferred embodiment of the inventions, the firearm also includes a harmonic tuner assembly for the barrel.

Abstract: A bolt action firearm that cocks the firing pin upon closing the bolt and includes a cam pin for a high velocity rimfire cartridge. In one embodiment, actuating the main spring while closing the bolt, instead of while opening the bolt, provides added safety against misfiring. A safety system is provided for the trigger mechanism and a robust connecting system for the stock.

Abstract: A semiautomatic firearm with redundant systems for reducing misfirings. A safety trigger is provided that is passively actuated in advance of a firing trigger. The safety trigger maintains redundant safety mechanisms that prevent inadvertent or accidental actuation of the firing trigger. The firing trigger can be configured for actuation with a very low magnitude or “soft” pull without compromising safety. For the disclosed embodiments, the safety trigger assures that the firearm is discharged only upon deliberate actuation of the firing trigger. In one embodiment, a trigger pull adjustment mechanism provides adjustment of the pull of the firing trigger to a desired force required by the operator. The disclosed trigger pull adjustment mechanism reduces the number of components and complexity of the machined parts over conventional trigger pull adjustment mechanisms.

Abstract: A bolt action firearm that cocks the firing pin upon closing the bolt and includes a cam pin with dual heads for a high velocity rimfire cartridge. In one embodiment, actuating the main spring while closing the bolt, instead of while opening the bolt, more uniformly distributes the physical energy required by the user over the bolt actuation cycle. The dual heads of the cam pin provide symmetric reactive forces with dual cam slots, thereby preventing the cam pin from skewing or canting within the cam slots. A safety system is provided for the trigger mechanism and a robust connecting systems for the stock.

Abstract: A bolt action firearm that cocks the firing pin upon closing the bolt and includes a cam pin with dual heads for a high velocity rimfire cartridge. In one embodiment, actuating the main spring while closing the bolt, instead of while opening the bolt, more uniformly distributes the physical energy required by the user over the bolt actuation cycle. The dual heads of the cam pin provide symmetric reactive forces with dual cam slots, thereby preventing the cam pin from skewing or canting within the cam slots. A safety system is provided for the trigger mechanism and a robust connecting systems for the stock.