A buffer for a firearm may include a piston and housing, along with an internal spring and force absorbing materials to reduce damage and wear on a buffer, allowing safe use of a wide range of loads in a firearm, or in the case of some high-power firearms such as 0.308 Win AR variants, providing additional durability to the buffer.

A system for firing reduced energy cartridges from a modern sporting rifle utilizes a bolt assembly weighing less than a conventional bolt assembly for such rifles and utilizes blow back for cycling the bolt assembly rather than gas operation. A bolt insert in a polymer bolt carrier of the bolt assembly has a projection that fits within a recess on the rear face of reduced energy cartridges. The reduced energy cartridges having a polymer casing, a rimfire power load for propellant, the power load recessed from the rear face of the casing. Tuning the bolt may comprise adjusting the weight of the bolt or the sliding resistance of the bolt assembly in the upper receiver. The bolt may be formed by metal injection molding with a polymer bolt carrier attached thereto.

A system for firing reduced energy cartridges from a modern sporting rifle utilizes a bolt assembly weighing less than a conventional bolt assembly for such rifles and utilizes blow back for cycling the bolt assembly rather than gas operation. A bolt insert in a polymer bolt carrier of the bolt assembly has a projection that fits within a recess on the rear face of reduced energy cartridges. The reduced energy cartridges having a polymer casing, a rimfire power load for propellant, the power load recessed from the rear face of the casing. Tuning the bolt may comprise adjusting the weight of the bolt or the sliding resistance of the bolt assembly in the upper receiver. The bolt may be formed by metal injection molding with a polymer bolt carrier attached thereto.

A firearm includes a frame, a barrel, a slide, and a recoil spring assembly. The barrel is coupled to the frame. The slide is coupled to the frame and is movable relative to the frame along a recoil axis. The recoil spring assembly is coupled to the frame and to the slide. The recoil spring assembly is retained within the slide and is situated between the barrel and the slide. The recoil spring assembly biases the slide to a fully forward position relative to the frame. The recoil spring assembly transfers a recoil force from the slide to the frame.

A firearm includes a frame, a barrel, a slide, and a recoil spring assembly. The barrel is coupled to the frame. The slide is coupled to the frame and is movable relative to the frame along a recoil axis. The recoil spring assembly is coupled to the frame and to the slide. The recoil spring assembly is retained within the slide and is situated between the barrel and the slide. The recoil spring assembly biases the slide to a fully forward position relative to the frame. The recoil spring assembly transfers a recoil force from the slide to the frame.

The present device is a shortened recoil system designed to replace the AR-15 type recoil system, comprising the standard recoil systems of many commonly used rifles including the AR-10, AR-15, M-16 and M-4. This shortened recoil system removes or replaces the parts of the traditional recoil system located in the stocks of these rifles and place the entire recoil system within the receiver, while maintaining the alignment of the recoil system with the barrel of the rifle. A major advantage of the present system is that it allows the rifle to be fired with a folded stock or even with no stock at all, as no part of the present recoil system is located within the stock.

The present device is a shortened recoil system designed to replace the AR-15 type recoil system, comprising the standard recoil systems of many commonly used rifles including the AR-10, AR-15, M-16 and M-4. This shortened recoil system removes or replaces the parts of the traditional recoil system located in the stocks of these rifles and place the entire recoil system within the receiver, while maintaining the alignment of the recoil system with the barrel of the rifle. A major advantage of the present system is that it allows the rifle to be fired with a folded stock or even with no stock at all, as no part of the present recoil system is located within the stock.

A weapon system is provided. The weapon system includes a receiver and an operating group. The operating group includes a bolt at least partially housed within the receiver; an operating rod (op-rod) assembly arranged to axially translate within the bolt. The operating group also includes a carrier assembly, a bolt assembly, and a recoil assembly. The system further includes a hinge or pivot joint at a connection between the recoil assembly and the carrier assembly, a firing pin lock, an elastomeric cone interface between the bolt assembly and the receiver, a hollowed out piston, and/or tapering on the lug of the bolt assembly.

A weapon system is provided. The weapon system includes a receiver and an operating group. The operating group includes a bolt at least partially housed within the receiver; an operating rod (op-rod) assembly arranged to axially translate within the bolt. The operating group also includes a carrier assembly, a bolt assembly, and a recoil assembly. The system further includes a hinge or pivot joint at a connection between the recoil assembly and the carrier assembly, a firing pin lock, an elastomeric cone interface between the bolt assembly and the receiver, a hollowed out piston, and/or tapering on the lug of the bolt assembly.

An automatic firearm having an inertial automation system comprises a barrel, which is movable along its own axis, a bolt support with a bolt, a recoil spring, a buffer spring and a hammer spring, a trigger mechanism, an ammunition feed mechanism, a mechanism for coordinating the actual firing, and a bolt support latch. The springs and the mechanism for coordinating the actual firing ensure a constant-value recoil force during automatic fire. Technical result consists in the improvement of the shooter's operating conditions, reduced vibration, and decreased bullet dispersion.