A shoulder fired weapon comprising: a lower receiver, a magazine removably attachable to the lower receiver; a buffer tube attached to the lower receiver; a buttstock attached to the buffer tube, and where the buttstock can rotate with respect to the lower receiver and the buttstock can lock into place. A rotating buffer apparatus comprising: a front end buffer tube, the front end buffer configured to screw into a lower receiver of a shoulder fired weapon; a rear end buffer tube, aligned with and adjacent to the front end buffer tube; the rear end buffer tube configured to attach to a buttstock; and where when the rotating buffer apparatus is installed into the shoulder fired weapon, the buttstock can rotate with respect to the lower receiver and the buttstock can lock into place.

A shoulder fired weapon comprising: a lower receiver, a magazine removably attachable to the lower receiver; a buffer tube attached to the lower receiver; a buttstock attached to the buffer tube, and where the buttstock can rotate with respect to the lower receiver and the buttstock can lock into place. A rotating buffer apparatus comprising: a front end buffer tube, the front end buffer configured to screw into a lower receiver of a shoulder fired weapon; a rear end buffer tube, aligned with and adjacent to the front end buffer tube; the rear end buffer tube configured to attach to a buttstock; and where when the rotating buffer apparatus is installed into the shoulder fired weapon, the buttstock can rotate with respect to the lower receiver and the buttstock can lock into place.

Recoil buffers are described that can complete a displacement cycle in about 0.06 seconds or less. The buffer can include two springs and three one-way valves through the piston within the buffer housing or can include a single spring and a one-way shim valve through the piston within the buffer housing.

Recoil buffers are described that can complete a displacement cycle in about 0.06 seconds or less. The buffer can include two springs and three one-way valves through the piston within the buffer housing or can include a single spring and a one-way shim valve through the piston within the buffer housing.

A receiver assembly for a rifle includes a receiver with a feed assembly configured for open-bolt operation. A feed cover is hingedly mounted to the receiver and includes a portion of the feed assembly, where the feed cover is movable between a closed position and an open position by pivoting about a hinge pin oriented along a longitudinal axis of the receiver. For example, the feed cover can pivot to one side of the receiver when in the open position. A rifle incorporating the receiver assembly is also disclosed.

A receiver assembly for a rifle includes a receiver with a feed assembly configured for open-bolt operation. A feed cover is hingedly mounted to the receiver and includes a portion of the feed assembly, where the feed cover is movable between a closed position and an open position by pivoting about a hinge pin oriented along a longitudinal axis of the receiver. For example, the feed cover can pivot to one side of the receiver when in the open position. A rifle incorporating the receiver assembly is also disclosed.

A striking mechanism for triggering a firing pin of an externally or self-powered weapon that has a breech. The striking mechanism including a kinematic mechanism having a trigger rocker, a safety device and a release. The trigger rocker acts on the safety device such that the release functionally interacts with a striking hammer. The striking hammer having a telescopic pushrod. A spring mounted around the telescopic pushrod is tensioned when the breech is advanced and a catching edge of the release engages under a catching edge of the striking hammer.

A striking mechanism for triggering a firing pin of an externally or self-powered weapon that has a breech. The striking mechanism including a kinematic mechanism having a trigger rocker, a safety device and a release. The trigger rocker acts on the safety device such that the release functionally interacts with a striking hammer. The striking hammer having a telescopic pushrod. A spring mounted around the telescopic pushrod is tensioned when the breech is advanced and a catching edge of the release engages under a catching edge of the striking hammer.

In some embodiments, a firearm mechanism comprises a bolt carrier comprising a bolt carrier cavity, a buffer comprising a buffer cavity and a weight arranged to travel between the bolt carrier cavity and the buffer cavity. The buffer cavity comprises a damping mechanism comprising a reduction in a cross-sectional size of the buffer cavity. In some embodiments, the damping mechanism and weight comprise a valve arrangement arranged to pressurize the buffer cavity and damp kinetic energy carried by the weight.

In some embodiments, a firearm mechanism comprises a bolt carrier comprising a bolt carrier cavity, a buffer comprising a buffer cavity and a weight arranged to travel between the bolt carrier cavity and the buffer cavity. The buffer cavity comprises a damping mechanism comprising a reduction in a cross-sectional size of the buffer cavity. In some embodiments, the damping mechanism and weight comprise a valve arrangement arranged to pressurize the buffer cavity and damp kinetic energy carried by the weight.