A lower receiver assembly of a rifle including a lower receiver having a magazine well formed thereon between a distal end and a proximal end, the lower receiver operable to receive a trigger assembly including a trigger, a hammer, and a firing pin. The lower receiver can include an operating rod retention tab coupled with an upper surface of the receiver and the operating rod retention tab extends above the upper surface and is operable to be received in a groove formed in a receiver of an upper receiver.

A bullpup shotgun which ejects shells from the bottom of its action has a reciprocable cover which, when in a closed position, overlies the breech end of the shotgun's barrel. When in an open position, the cover is in spaced relation to the barrel breech end, allowing access to the shotgun's action to clear an ammunition feed malfunction. The cover is mounted on a butt stock, and is slidable or rotatable relatively to the shotgun's butt stock to effect motion of the cover between the open and closed positions.

A bullpup shotgun which ejects shells from the bottom of its action has a reciprocable cover which, when in a closed position, overlies the breech end of the shotgun's barrel. When in an open position, the cover is in spaced relation to the barrel breech end, allowing access to the shotgun's action to clear an ammunition feed malfunction. The cover is mounted on a butt stock, and is slidable or rotatable relatively to the shotgun's butt stock to effect motion of the cover between the open and closed positions.

A firearm attachment member includes a firearm mounting structure which includes a receiver support shelf for supporting thereon a receiver of a firearm. The firearm attachment member includes left and right halves, arranged for securing the firearm between the left and right halves, each of the left and right halves extending along a longitudinal axis corresponding to a longitudinal firing axis of the firearm. One of the left and right halves pivots in azimuth with respect to the longitudinal axis about a firearm attachment member pivot located rearward of the firearm mounting structure. Each of the left and right halves includes a forward fastening flange configured to be mounted below the receiver and in front of the trigger guard of the firearm. The forward fastening flanges are fastened together with a fastener.

A firearm attachment member includes a firearm mounting structure which includes a receiver support shelf for supporting thereon a receiver of a firearm. The firearm attachment member includes left and right halves, arranged for securing the firearm between the left and right halves, each of the left and right halves extending along a longitudinal axis corresponding to a longitudinal firing axis of the firearm. One of the left and right halves pivots in azimuth with respect to the longitudinal axis about a firearm attachment member pivot located rearward of the firearm mounting structure. Each of the left and right halves includes a forward fastening flange configured to be mounted below the receiver and in front of the trigger guard of the firearm. The forward fastening flanges are fastened together with a fastener.

A receiver and a method for manufacturing it are disclosed. The receiver contains an assembly pivotally coupled with the lower receiver, a buttstock coupled with the assembly, wherein the assembly is configured to move from a locked position to a folded position and back to the locked position.

A receiver and a method for manufacturing it are disclosed. The receiver contains an assembly pivotally coupled with the lower receiver, a buttstock coupled with the assembly, wherein the assembly is configured to move from a locked position to a folded position and back to the locked position.

A folding stock coupling system for a firearm. An openable/closeable hinge mechanism comprising front and rear hinge elements pivotably mounts the rear stock to the main body of the firearm. The hinge mechanism is selectively movable between a locked condition when the stock is unfolded and inline with the main body for firing, and an unlocked condition when the stock is folded forward and offset from the main body for compact carrying or storage. A manually movable actuating button of the hinge mechanism selectively locks or unlocks the rear to the front hinge members in the locked and unlocked conditions, respectively. Embodiments include a detent mechanism for removably retaining the folded position. An elongated rear mounting extension coupled to the rear hinge member provides a common stock mounting interface compatible for interchanging a plurality of different stocks to the firearm each sharing a common mounting profile.

A folding stock coupling system for a firearm. An openable/closeable hinge mechanism comprising front and rear hinge elements pivotably mounts the rear stock to the main body of the firearm. The hinge mechanism is selectively movable between a locked condition when the stock is unfolded and inline with the main body for firing, and an unlocked condition when the stock is folded forward and offset from the main body for compact carrying or storage. A manually movable actuating button of the hinge mechanism selectively locks or unlocks the rear to the front hinge members in the locked and unlocked conditions, respectively. Embodiments include a detent mechanism for removably retaining the folded position. An elongated rear mounting extension coupled to the rear hinge member provides a common stock mounting interface compatible for interchanging a plurality of different stocks to the firearm each sharing a common mounting profile.

A brace assembly includes a firearm attachment member to which a pivot arm is pivotally attached at a pivot. The pivot arm includes a brace member at an end opposite to the pivot. The firearm attachment member includes firearm mounting structure which includes a receiver support shelf for supporting thereon a receiver of a firearm, and a distal abutment against which a forward end of a receiver and/or a slide of the firearm is abuttable.