A semi-automatic or automatic rifle comprising a barrel attached to and upper receiver and including a compressible bolt carrier extension system. The compressible bolt carrier extension system includes a bolt carrier, an extension spring, two pins, and a reciprocation bolt carrier extension piece. As a whole, the compressible bolt carrier extension system makes possible the use of elongated upper and lower receivers to be used for chambering long-action or other center fire cartridges for use with AR rifles such as the M-16, and M4 etc., eliminating the need for any buffer or buffer tubes other than those commercially available. A further advantage of the compressible bolt carrier extension system is the reduction of felt recoil as the system fully loads during the recoil stroke as it pushes against the buffer absorbing additional recoil energy. The system can be incorporated into firearms using a variety of cartridges.

A semi-automatic or automatic rifle comprising a barrel attached to and upper receiver and including a compressible bolt carrier extension system. The compressible bolt carrier extension system includes a bolt carrier, an extension spring, two pins, and a reciprocation bolt carrier extension piece. As a whole, the compressible bolt carrier extension system makes possible the use of elongated upper and lower receivers to be used for chambering long-action or other center fire cartridges for use with AR rifles such as the M-16, and M4 etc., eliminating the need for any buffer or buffer tubes other than those commercially available. A further advantage of the compressible bolt carrier extension system is the reduction of felt recoil as the system fully loads during the recoil stroke as it pushes against the buffer absorbing additional recoil energy. The system can be incorporated into firearms using a variety of cartridges.

The disclosure provides a mounting assembly for a handguard mounted on a barrel nut of a firearm. The handguard defines a gap over a portion of the barrel nut and includes first and second portions at respective first and second sides of the gap. The mounting assembly includes a tie rod extending between the first and second sides of the gap along a longitudinal axis of the tie rod and a first fastener, distinct from the tie rod, interconnecting a first end of the tie rod to the first portion of the handguard. A second end of the tie rod is interconnected to the second portion of the handguard and actuation of the first fastener in a tightening direction draws the first and second portions of the handguard toward each other and generates tension in the tie rod.

The disclosure provides a mounting assembly for a handguard mounted on a barrel nut of a firearm. The handguard defines a gap over a portion of the barrel nut and includes first and second portions at respective first and second sides of the gap. The mounting assembly includes a tie rod extending between the first and second sides of the gap along a longitudinal axis of the tie rod and a first fastener, distinct from the tie rod, interconnecting a first end of the tie rod to the first portion of the handguard. A second end of the tie rod is interconnected to the second portion of the handguard and actuation of the first fastener in a tightening direction draws the first and second portions of the handguard toward each other and generates tension in the tie rod.

A rifle with a barrel firmly mounted in a framework, the barrel including a locking sleeve, a lock, a sliding block, and a gas-powered actuator. Advantageously quiet operation of the gas-powered actuator is accomplished when the actuator has an annular piston, which is movable on a plunger support, forming an expansion chamber, where the actuator acts on the sliding block via push rods and is pushed forward by reset springs, and the rifle further includes a gas borehole penetrating the walls of the barrel and the plunger support, and further where the plunger support includes an outlet channel in its front, upper range, which is fluidly separate from the expansion chamber when the annular piston is at rest, and is fluidly connected with the expansion chamber after a backward displacement of the annular piston.

A rifle with a barrel firmly mounted in a framework, the barrel including a locking sleeve, a lock, a sliding block, and a gas-powered actuator. Advantageously quiet operation of the gas-powered actuator is accomplished when the actuator has an annular piston, which is movable on a plunger support, forming an expansion chamber, where the actuator acts on the sliding block via push rods and is pushed forward by reset springs, and the rifle further includes a gas borehole penetrating the walls of the barrel and the plunger support, and further where the plunger support includes an outlet channel in its front, upper range, which is fluidly separate from the expansion chamber when the annular piston is at rest, and is fluidly connected with the expansion chamber after a backward displacement of the annular piston.

A shear resistant bolt carrier and gas key are provided having a mating recoil lug and recoil lug slot that transfer shear forces between the gas key and bolt carrier to reduce and eliminate shear forces on the screw attachment points and eliminate a point of failure in the bolt carrier group (BGC).

A shear resistant bolt carrier and gas key are provided having a mating recoil lug and recoil lug slot that transfer shear forces between the gas key and bolt carrier to reduce and eliminate shear forces on the screw attachment points and eliminate a point of failure in the bolt carrier group (BGC).

A gas piston assembly comprises a piston apparatus having a first end and a second end. A piston bonnet has a bonnet end wall with a bonnet aperture defined therethrough and a bonnet sidewall to receive the second end of the piston apparatus therein. A piston gap is between the second end of the piston apparatus and the bonnet end wall and communicates with the bonnet aperture. An adjustable gas regulator communicates with the bonnet aperture and selectively occludes the bonnet aperture in fully open, partially open and fully closed orientations. The bonnet end wall includes a threaded bore in communication with the bonnet aperture. The gas regulator includes a threaded shaft received within the threaded bore which translates to selectively occlude the bonnet aperture. The threaded shaft includes a head portion gripped by a user while a detent engages a recess on a bottom face of the head portion.

An assembly for mounting a handguard on a barrel nut of a firearm. The firearm has a gas piston action that includes an operating rod. The assembly includes a tie rod having a reduced thickness middle portion that extends between the barrel nut and the operating rod. The tie rod has connectors at each end. Fasteners are inserted from opposite sides of the handguard and connect to the tie rod connectors. The fasteners are threaded into clamp blocks such that rotation of the fasteners applies compression on the handguard against the barrel nut and a generates a reactive tensile load in the tie bar.