An adjustable buffer optionally including at least some of a buffer element having an elongate buffer element body portion, wherein the buffer element body portion includes an externally threaded portion; a collar nut having a collar nut aperture formed therethrough, wherein at least a portion of the collar nut aperture is internally threaded so as to interact with the externally threaded portion of the buffer element body portion, and wherein one or more collar nut recesses are formed in the collar nut; and a locking collar having a locking collar aperture formed therethrough, wherein the locking collar aperture is formed so as to accept at least a portion of the buffer element body portion therethrough, wherein the locking collar includes one or more locking collar protrusions, and wherein the one or more locking collar protrusions are mateable with the one or more collar nut recesses.

An adjustable buffer system, including at least some of a buffer, wherein the buffer element includes a collar cavity and a spacer cavity, wherein a bolt aperture is formed between the collar cavity and the spacer cavity, and wherein two or more longitudinally extending slots are formed in at least a portion of the buffer element; an adjustment bolt, wherein the adjustment bolt comprises an externally threaded body portion; a slidable collar than includes a ring portion surrounding a core portion and spaced apart by two or more legs, and wherein prong apertures are defined between the ring portion, the core portion, and the legs, wherein each of the legs corresponds to a longitudinally extending slot, such that the slidable collar is repeatably slidable along at least a portion of the buffer element as rotational force is applied to the adjustment bolt.

An adjustable buffer system, including at least some of a buffer, wherein the buffer element includes a collar cavity and a spacer cavity, wherein a bolt aperture is formed between the collar cavity and the spacer cavity, and wherein two or more longitudinally extending slots are formed in at least a portion of the buffer element; an adjustment bolt, wherein the adjustment bolt comprises an externally threaded body portion; a slidable collar than includes a ring portion surrounding a core portion and spaced apart by two or more legs, and wherein prong apertures are defined between the ring portion, the core portion, and the legs, wherein each of the legs corresponds to a longitudinally extending slot, such that the slidable collar is repeatably slidable along at least a portion of the buffer element as rotational force is applied to the adjustment bolt.

A buffer assembly for a firearm has a tubular receiver extension. A damper assembly is positioned within the receiver extension adjacent the receiver extension rear end, and a spring is positioned within the receiver extension with the rear end of the spring surrounding the damper assembly. A buffer is positioned within the receiver extension at the opposite end of the spring from the damper assembly. The receiver extension has a liner that surrounds the spring creating a layer between the spring and the receiver extension. The liner may be a friction reducing material such as a polymer material.

A buffer assembly for a firearm has a tubular receiver extension. A damper assembly is positioned within the receiver extension adjacent the receiver extension rear end, and a spring is positioned within the receiver extension with the rear end of the spring surrounding the damper assembly. A buffer is positioned within the receiver extension at the opposite end of the spring from the damper assembly. The receiver extension has a liner that surrounds the spring creating a layer between the spring and the receiver extension. The liner may be a friction reducing material such as a polymer material.

In some embodiments, a tunable recoil assembly is provided. The tunable recoil assembly may include a guide rod having a front end, a length, and a rear end; one or more springs around the length of the guide rod; and a removable cap releasably coupled to one of the ends of the guide rod. In some embodiments, the removable cap may be retained using a spring force, and may be slidingly coupled, twistingly coupled, or otherwise releasably coupled to the one of the ends of the guide rod.

In some embodiments, a tunable recoil assembly is provided. The tunable recoil assembly may include a guide rod having a front end, a length, and a rear end; one or more springs around the length of the guide rod; and a removable cap releasably coupled to one of the ends of the guide rod. In some embodiments, the removable cap may be retained using a spring force, and may be slidingly coupled, twistingly coupled, or otherwise releasably coupled to the one of the ends of the guide rod.

An improved recoil reduction system comprises a forward body, a friction spring, a rear body, a bolt, and, optionally, a bumper. When in forward battery, the said friction spring is compressed to a preloaded operating point by the bolt. In embodiments, when a weapon equipped with the improved recoil reduction system is fired, the front body is impacted by the bolt carrier group of the weapon and the rear body moves aft and strikes the rear of the shoulder stock of the weapon, compressing the friction spring. During compression, the tapered mating surfaces of the friction spring generate friction and thereby dissipate the energy generated from firing the weapon in the form of heat, thus reducing the felt recoil of the weapon.

An improved recoil reduction system comprises a forward body, a friction spring, a rear body, a bolt, and, optionally, a bumper. When in forward battery, the said friction spring is compressed to a preloaded operating point by the bolt. In embodiments, when a weapon equipped with the improved recoil reduction system is fired, the front body is impacted by the bolt carrier group of the weapon and the rear body moves aft and strikes the rear of the shoulder stock of the weapon, compressing the friction spring. During compression, the tapered mating surfaces of the friction spring generate friction and thereby dissipate the energy generated from firing the weapon in the form of heat, thus reducing the felt recoil of the weapon.

An action system for reducing recoil and muzzle rise in firearms is provided. The action system includes an outer housing having an internal cavity, a buffer tube in operable communication with a bolt carrier group of a firearm, and a slidable buffer within the buffer tube. A lever arm, pivotally secured within the outer housing, is operably connected to the buffer and moves radially under the buffer's force. A spring in the cavity engages with the lever arm, compressing as the lever arm is acted upon by the linear force produced by a bolt carrier group until the spring force exceeds the linear force, thus forcing the buffer in a direction opposite the direction of the linear force.