Patent attributes
The embodiments described herein relate to a sleeve piston for operating the bolt carrier of an auto-loading firearm. The sleeve piston can comprise a monolithic sleeve piston or it can comprise two or more sleeve-piston parts, thereby evenly distributing the reciprocating mass of an auto-loading firearm about its barrel and minimizing muzzle rise when fired. The sleeve piston can be coupled to the bolt carrier by two or more operating rods, thereby reducing the tipping force experienced by the bolt carrier during firearm operation. The sleeve piston can reciprocate in or on a gas block coupled to the barrel, and the sleeve piston can be removed by sliding it forward and off the end of the barrel. The embodiments of the present invention can thus provide a balanced and compact operating mechanism that is ideally suited for rifles, carbines, and personal-defense weapons.
