Apparatus and method for actuating a bolt carrier group of a receiver assembly

摘要

An apparatus adapted for actuating a bolt carrier group apparatus comprising a piston tube attached to a receiver assembly. An operating rod is disposed in a bore of the piston tube. A piston is engaged with a first end of the operating rod. The operating rod moves from a static position to a displaced position when a combustion gas is exposed to a face of the piston. A bolt carrier including a bolt carrier lug is disposed in a bolt carrier lug channel of an upper receiver body. A tappet rod is engaged with the bolt carrier lug. The tappet rod moves substantially in unison with the operating rod. A yoke is attached to the tappet rod and to the operating rod. The yoke is mounted movably on the piston tube. An adjustable pressure regulator is coupled to the piston tube for regulating discharge of the combustion gas therethrough.