Abstract: Magazine release apparatus and firearms including such magazine release apparatus are disclosed. An example bolt release for use with a firearm includes a first handle to protrude from a first side of the firearm and a second handle to protrude from a second side of the firearm. The first and second handles are integral. The first and second handles are to enable the bolt release to be operable from the first and second sides of the firearm. The bolt release includes a pivot axis adjacent the first side or the second side. The pivot axis is to enable the bolt release to be pivoted between a release position and a retained position. The bolt release to be biased toward the release position.

Abstract: Magazine release apparatus and firearms including such magazine release apparatus are disclosed. An example magazine release apparatus for use with a firearm includes a magazine retaining arm including a longitudinal slot, a first handle to protrude from a first side of the firearm and a second handle to protrude from a second side of the firearm. The second handle includes a rocker arm having a feature to be supported on a receiver of the firearm. The first and second handles are actuatable to move the magazine release apparatus between a magazine retaining position and a magazine releasing position. In the magazine retaining position, the second handle is at least partially supported by the longitudinal slot and the feature extends toward the receiver.

Abstract: Magazine release apparatus and firearms including such magazine release apparatus are disclosed. An example bolt release for use with a firearm includes a first handle to protrude from a first side of the firearm and a second handle to protrude from a second side of the firearm. The first and second handles are integral. The first and second handles are to enable the bolt release to be operable from the first and second sides of the firearm. The bolt release includes a pivot axis adjacent the first side or the second side. The pivot axis is to enable the bolt release to be pivoted between a release position and a retained position.

Abstract: Magazine release apparatus and firearms including such magazine release apparatus are disclosed. An example magazine release apparatus for use with a firearm includes a magazine retaining arm including a longitudinal slot, a first handle to protrude from a first side of the firearm and a second handle to protrude from a second side of the firearm. The second handle includes a rocker arm having a feature to be supported on a receiver of the firearm. The first and second handles are actuatable to move the magazine release apparatus between a magazine retaining position and a magazine releasing position. In the magazine retaining position, the second handle is at least partially supported by the longitudinal slot and the feature extends toward the receiver.

Abstract: A firearm includes a cocking lever, a shoulder-stock receptacle and a shoulder support having a shoulder stock configured to be joined by a connector to the shoulder-stock receptacle. A shoulder-stock adjuster is configured to adjust a position of the shoulder stock relative to the shoulder-stock receptacle along an adjustment axis. A cheek rest is mounted via a bearing on the shoulder stock so as to be movable in a direction parallel to the adjustment axis. A stop is disposed on the shoulder-stock receptacle so as to limit a movement path of the cheek rest towards a front of the firearm. At a position of the cheek rest defined by the stop of the shoulder-stock receptacle, the cocking lever does not collide with the cheek rest, even in a completely retracted state.

Abstract: A firearm includes a cocking lever, a shoulder-stock receptacle and a shoulder support having a shoulder stock configured to be joined by a connector to the shoulder-stock receptacle. A shoulder-stock adjuster is configured to adjust a position of the shoulder stock relative to the shoulder-stock receptacle along an adjustment axis. A cheek rest is mounted via a bearing on the shoulder stock so as to be movable in a direction parallel to the adjustment axis. A stop is disposed on the shoulder-stock receptacle so as to limit a movement path of the cheek rest towards a front of the firearm. At a position of the cheek rest defined by the stop of the shoulder-stock receptacle, the cocking lever does not collide with the cheek rest, even in a completely retracted state.

Abstract: Coupling pins for connecting weapon components are described. An example fastener to couple weapon components includes an elongated body defining a first aperture. The first aperture being defined along a longitudinal axis of the elongated body. Tension member and a biasing element being positioned within the first aperture. The elongated body defining a second aperture. The second aperture being defined through a portion of the elongated body to enable a tension element, positioned at least partially within the second aperture, to be urged from the elongated by via an interaction with the tension member. The fastener is insertable into aligned apertures of respective first and second weapon components. The tension element being urged from the elongated body to interact with the second weapon component to urge the second weapon component into further engagement with the first weapon component.

Abstract: Firing assemblies for use with firearms are described. A firing assembly for use with a firearm includes a hammer pivotably coupled to a hammer shaft. The hammer includes a hammer stop notch that at least partially engages a portion of a lever of a trigger assembly when the hammer is in a cocked position and a control curve section that engages a surface of the lever to retain the lever in an unlocked position as the hammer moves between the cocked position and a firing position. Additionally, the firing assembly includes a control element pivotably coupled to the hammer shaft and adjacent the hammer, wherein the control element includes a first control curve portion that at least partially adjoins the control curve section and wherein the hammer interacts with the control element to change a control curve region as the hammer moves between cocked position and the firing position.

Abstract: Coupling pins for connecting weapon components are described. An example fastener to couple weapon components includes an elongated body defining a first aperture. The first aperture being defined along a longitudinal axis of the elongated body. Tension member and a biasing element being positioned within the first aperture. The elongated body defining a second aperture. The second aperture being defined through a portion of the elongated body to enable a tension element, positioned at least partially within the second aperture, to be urged from the elongated by via an interaction with the tension member. The fastener is insertable into aligned apertures of respective first and second weapon components. The tension element being urged from the elongated body to interact with the second weapon component to urge the second weapon component into further engagement with the first weapon component.

Abstract: Locking systems for use with firearms are described. An example locking system for use with a firearm includes a breechblock carrier and a lock spring mechanism that includes a piston. The breechblock carrier is configured to interaction with the piston. Additionally, the example locking system includes a first aperture. The piston is configured to expel fluid through the first aperture when the breechblock carrier retracts.

Abstract: Plastic magazines for use with firearms are described. An example plastic magazine for use with firearms includes a plurality of sidewalls along which cartridges are to be moved during a reloading of a firearm. Each of the plurality of sidewalls comprises a plastic material. Additionally, the example plastic magazine includes a metal coating adjacent a first surface of a first sidewall of the plurality of sidewalls, wherein the interior surface of the first sidewall is in a direction of fire.

Abstract: Plastic magazines for use with firearms are described. An example plastic magazine for use with firearms includes a plurality of sidewalls along which cartridges are to be moved during a reloading of a firearm. Each of the plurality of sidewalls comprises a plastic material. Additionally, the example plastic magazine includes a metal coating adjacent a first surface of a first sidewall of the plurality of sidewalls, wherein the interior surface of the first sidewall is in a direction of fire.

Abstract: Adjustable shoulder stock apparatus for use with firearms are described. An example adjustable shoulder stock apparatus for use with firearms includes a shoulder stock into which a connecting piece of the firearm is to be inserted. The connecting piece defines a plurality of boreholes. Additionally, the example adjustable shoulder stock apparatus includes a bolt having a end to be inserted in one of the plurality of boreholes to secure the shoulder stock relative to the connecting piece. Further the example adjustable shoulder stock apparatus includes a lever that defines a recess that is open toward a top of the firearm and is closed toward a bottom of the firearm. An opposite end of the bolt is positioned in the recess and coupled to the lever. The lever is to remove the bolt from the one of the plurality of boreholes. The lever comprises a projection to engage a wall of the shoulder stock to prevent movement of the lever past the wall.

Abstract: Locking systems for use with firearms are described. An example locking system for use with a firearm includes a breechblock carrier and a lock spring mechanism that includes a piston. The breechblock carrier is configured to interaction with the piston. Additionally, the example locking system includes a first aperture. The piston is configured to expel fluid through the first aperture when the breechblock carrier retracts.

Abstract: A connecting piece couplable to a rail of a weapon is described. An example connecting pieces includes a first retaining element including a first receiving region configured to engage a corresponding first counterface of the rail. The example connecting piece also includes a second retaining element including a second receiving region configured to engage a corresponding second counterface of the rail. In addition, the example connecting piece includes a guide slot running diagonally to a longitudinal direction of the rail via which the first retaining element and the second retaining elements are coupled.

Abstract: Firing assemblies for use with firearms are described. A firing assembly for use with a firearm includes a hammer pivotably coupled to a hammer shaft. The hammer includes a hammer stop notch that at least partially engages a portion of a lever of a trigger assembly when the hammer is in a cocked position and a control curve section that engages a surface of the lever to retain the lever in an unlocked position as the hammer moves between the cocked position and a firing position. Additionally, the firing assembly includes a control element pivotably coupled to the hammer shaft and adjacent the hammer, wherein the control element includes a first control curve portion that at least partially adjoins the control curve section and wherein the hammer interacts with the control element to change a control curve region as the hammer moves between cocked position and the firing position.

Abstract: A connecting piece couplable to a rail of a weapon is described. An example connecting pieces includes a first retaining element including a first receiving region configured to engage a corresponding first counterface of the rail. The example connecting piece also includes a second retaining element including a second receiving region configured to engage a corresponding second counterface of the rail. In addition, the example connecting piece includes a guide slot running diagonally to a longitudinal direction of the rail via which the first retaining element and the second retaining elements are coupled.

Abstract: A hand guard system for use with a firearm is described. A holding unit for releasably coupling the hand guard system to a firearm includes a coupling element having an opening, a flange, and at least one coupling portion. The flange and the coupling portion form the opening so that the coupling element is slidably removable about the barrel of the firearm, and an inner surface of the coupling portion engages an outer surface of the barrel nut. The holding unit further includes a sleeve operatively coupled to the coupling element having an inner surface defining an opening so that the sleeve is slidably removable about the barrel of the firearm and the inner surface forms a shoulder and defines a groove distally located from the shoulder and sized to receive a snap ring. The snap ring retains the sleeve to the coupling element such that the shoulder and snap ring are located on opposite sides of the flange of the coupling element.

Abstract: Methods and apparatus are described for gas cylinder components for use with a firearm with a barrel. The gas cylinder component includes a reception bore for receiving the barrel. Additionally, the gas cylinder component includes a torque-proof fixture that is under pre-stressing, wherein the torque-proof fixture comprises one or more bores tangential to the barrel further including a pin to create spring pinning action. Further, the gas cylinder component includes a foresight that is rotatable around an axis, and a demountable clamping device that secures at least one position of the foresight. The gas cylinder component is under spring pre-stressing and is torque proof on the barrel. Additionally, the gas cylinder component is to lock on the barrel. Further, the engagement of the gas cylinder component on the barrel is to substantially prevent the rotation of the gas cylinder apparatus relative to an axis of the barrel.

Abstract: Field adjustable gas bleed assemblies for use with firearms are described. An example field adjustable gas bleed assembly for use with a firearm having a barrel includes a gas cylinder that defines a pressure chamber to be fluidly coupled to a bore of a barrel, wherein the gas cylinder is substantially fixed relative to the barrel. Additionally, the example field adjustable gas bleed assembly includes a fluid control apparatus to control a flow rate of fluid between the pressure chamber and the barrel. The fluid control apparatus is adjustable between a first operation mode and a second operation mode that is different from the first operation mode. The fluid control apparatus includes a first borehole having a first cross-sectional area. The first borehole is associated with the first operation mode. Additionally, the fluid control apparatus includes a second borehole having a second cross-sectional area different from the first cross-sectional area.