Patent ID: 9261314
Filing Date: 2016-02-16
CPC Classification: F41A

Claim Text:
1. A system for operating a firearm bolt carrier, wherein the firearm fires one of a centerfire rifle or a centerfire pistol cartridge, the system comprising: a. a receiver that carries the bolt carrier; b. a rifled barrel coupled to the receiver, wherein the rifled barrel includes a gas port for tapping expansion gases from the rifled barrel; c. a sleeve piston that reciprocates along the rifled barrel, wherein the sleeve piston acts to operate the bolt carrier in response to the expansion gases; d. a gas block that moveably receives the sleeve piston to define an expansion chamber, wherein the expansion chamber receives the expansion gases from the gas port; e. a first rod operatively coupling the sleeve piston to the bolt carrier; and f. a second rod operatively coupling the sleeve piston to the bolt carrier.