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 gun includes a bolt, a bolt stop member and a shock-absorption device. The bolt is movable forward or backward in a gun body, accumulates a pressure of a buffer spring while moving backward according to manipulation of the gun, and moves forward by releasing the accumulated pressure. The bolt stop member stops the bolt moving forward. The shock-absorption device includes a shock-absorption link which engages with a shock-absorption shaft which acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement of the bolt and the bolt stop portion.

A gun includes a bolt, a bolt stop member and a shock-absorption device. The bolt is movable forward or backward in a gun body, accumulates a pressure of a buffer spring while moving backward according to manipulation of the gun, and moves forward by releasing the accumulated pressure. The bolt stop member stops the bolt moving forward. The shock-absorption device includes a shock-absorption link which engages with a shock-absorption shaft which acts on the bolt stop member to absorb an impact force applied to the bolt stop member by the engagement of the bolt and the bolt stop portion.

Provided is a side charging handle system for an AR-pattern firearm with an upper receiver having an internal longitudinal bore for receiving a bolt carrier assembly for longitudinal reciprocation therein, a side longitudinal guide slot, and a side charging handle having an engagement pin extending through guide slot to engage the bolt carrier assembly. Also provided is a compact bolt carrier system including an upper receiver having an internal longitudinal bore for receiving a bolt carrier assembly for longitudinal reciprocation therein and a longitudinal recoil spring guide channel positioned above the internal longitudinal bore. The bolt carrier assembly has a bolt carrier body configured in length to reciprocate substantially entirely within the upper receiver and has a top lug extending into the recoil spring guide channel. A recoil spring is in the recoil spring guide channel.

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.

Apparatuses, systems, and methods are provided for selectively changing the force required to cycle a firearm. In some embodiments, an apparatus is provided with at least two biasing members or springs where one biasing member generates a softer or smaller force than another biasing member. When manually cycling the firearm, the softer biasing member reduces the effort required for a person to cycle the firearm, which reduces the likelihood of injury and allows people with a broader range of physical abilities to cycle the firearm. Then, when the firearm fires a round, the other biasing member provides the greater force required to cycle the firearm in a conventional, semi-automatic or automatic manner.

Apparatuses, systems, and methods are provided for selectively changing the force required to cycle a firearm. In some embodiments, an apparatus is provided with at least two biasing members or springs where one biasing member generates a softer or smaller force than another biasing member. When manually cycling the firearm, the softer biasing member reduces the effort required for a person to cycle the firearm, which reduces the likelihood of injury and allows people with a broader range of physical abilities to cycle the firearm. Then, when the firearm fires a round, the other biasing member provides the greater force required to cycle the firearm in a conventional, semi-automatic or automatic manner.

In various embodiments, a buffer retention system may comprise a body, a retention tab and a spring. The body may comprise a generally cylindrical portion and a partially annular guide portion. The generally cylindrical portion may define a channel. The partially annular guide portion may be operatively coupled to the cylindrical portion. The retention tab may be installable in the channel. The retention tab may be configured to protrude through the partially annular guide portion. The spring may be installable within the channel. The spring may be configured to position the retention tab through the partially annular guide portion.