Semi-automatic rifle including a free floating barrel with a muzzle located at a distal end and an engagement mechanism at a proximal end. The barrel has a length measured from the proximal end to the distal end. A receiver can be configured to couple the engagement mechanism of the barrel and a bolt at least partially rotatably mounted relative to the receiver. A gas cylinder system being coupled to the barrel substantially close to the muzzle and including an operating rod. A trigger assembly coupled to the receiver to receive at least a portion of the operating rod and a bridge coupled to the trigger assembly. A fire control located substantially within the trigger assembly and configured to actuate the bolt so as to eject a cartridge and load a subsequent cartridge from a clip.

Semi-automatic rifle including a free floating barrel with a muzzle located at a distal end and an engagement mechanism at a proximal end. The barrel has a length measured from the proximal end to the distal end. A receiver can be configured to couple the engagement mechanism of the barrel and a bolt at least partially rotatably mounted relative to the receiver. A gas cylinder system being coupled to the barrel substantially close to the muzzle and including an operating rod. A trigger assembly coupled to the receiver to receive at least a portion of the operating rod and a bridge coupled to the trigger assembly. A fire control located substantially within the trigger assembly and configured to actuate the bolt so as to eject a cartridge and load a subsequent cartridge from a clip.

An adjustable firearm stock has a body defining an elongated channel adapted to receive a rail, the channel having an internal width adapted to receive the width of the head portion of the rail, and opposed elongated hook surfaces defining a hook width adapted to receive the neck of the rail, the hook surfaces bear on the rail to resist separation of the body from the rail, the channel having an elongated floor surface parallel to and opposing the planar mounting surface of the rail, a foot element connected to the body and having a contact surface facing the planar mounting surface of the rail, and a securement facility operably connected to the foot element and to the body, and operable to move the foot with respect to the body to compress the rail between the contact surface of the foot and the hook surfaces.

A pistol grip stock attachment kit is for use with a conventional long gun. A central strap couples an improved butt or recoil plate rearwardly and a pistol grip forwardly. A rearward hinge pivotably couples the plate to the central strap. A forward hinge pivotably couples the pistol grip to the central strap.

A rear trunnion assembly includes: a modular rear trunnion fitting including a rear connection feature, an upper portion, and a lower portion; a folding hinge fitting including an upper lug, a lower lug, and a forward portion disposed under the modular rear trunnion fitting, the folding hinge fitting disposed on a rear side of the modular rear trunnion fitting, the forward portion including a first mounting hole configured to interface with the upper portion and a second mounting hole configured to interface with the lower portion; and a pivoting latch fitting configured to pivot with respect to the folding hinge fitting about an axis extending from the upper lug to the lower lug. The pivoting latch fitting may be configured to lock in at least one position with respect to the folding hinge fitting.

A rear trunnion assembly includes: a modular rear trunnion fitting including a rear connection feature, an upper portion, and a lower portion; a folding hinge fitting including an upper lug, a lower lug, and a forward portion disposed under the modular rear trunnion fitting, the folding hinge fitting disposed on a rear side of the modular rear trunnion fitting, the forward portion including a first mounting hole configured to interface with the upper portion and a second mounting hole configured to interface with the lower portion; and a pivoting latch fitting configured to pivot with respect to the folding hinge fitting about an axis extending from the upper lug to the lower lug. The pivoting latch fitting may be configured to lock in at least one position with respect to the folding hinge fitting.

A folding stock assembly for a firearm includes a hinge fitting attached to the firearm, a left hinge pin disposed on a left side of the hinge fitting, a right hinge pin disposed on a right side of the hinge fitting, at least one moving member, a rear housing disposed on a rear side of the hinge fitting, a rearward configuration wherein the rear housing is connected to both the left hinge pin and the right hinge pin, a left side folded configuration wherein the rear housing is connected to the left hinge pin and the rear housing is moved toward a left side of the firearm, and a right side folded configuration wherein the rear housing is connected to the right hinge pin and the rear housing is moved toward a right side of the firearm.

A folding stock assembly for a firearm includes a hinge fitting attached to the firearm, a left hinge pin disposed on a left side of the hinge fitting, a right hinge pin disposed on a right side of the hinge fitting, at least one moving member, a rear housing disposed on a rear side of the hinge fitting, a rearward configuration wherein the rear housing is connected to both the left hinge pin and the right hinge pin, a left side folded configuration wherein the rear housing is connected to the left hinge pin and the rear housing is moved toward a left side of the firearm, and a right side folded configuration wherein the rear housing is connected to the right hinge pin and the rear housing is moved toward a right side of the firearm.

An ambidextrous folding stock assembly for a firearm includes a forward hinge fitting attached to the firearm, a central assembly disposed on a rear side of the forward hinge fitting, and a rear hinge fitting disposed on a rear side of the central assembly. The central assembly includes at least one hinge body, an actuation portion including a lower portion disposed below the at least one hinge body, and at least one latch portion disposed below the at least one hinge body.

An ambidextrous folding stock assembly for a firearm includes a forward hinge fitting attached to the firearm, a central assembly disposed on a rear side of the forward hinge fitting, and a rear hinge fitting disposed on a rear side of the central assembly. The central assembly includes at least one hinge body, an actuation portion including a lower portion disposed below the at least one hinge body, and at least one latch portion disposed below the at least one hinge body.