Abstract

A gas piston retrofit assembly for a firearm having a bolt assembly mounted within a receiver, a barrel extending forward from the receiver, and a front sight block mounted on the barrel, includes a gas tube extending into the front sight block fluidly connected with the barrel, a piston cylinder having an arcuate-shaped piston chamber fluidly connected to the gas tube, a piston including an arcuate-shaped piston head extending forward from a piston body and telescopically received in the piston chamber, and a piston rod extending rearward from the piston body dimensioned and configured to extend into the receiver for engaging with a bolt assembly within the receiver, a stop ring dimensioned and configured for mounting on the barrel and for limiting rearward motion of the piston body, a bushing through which the piston rod extends.

IPC Classes  ?

• F41A 5/30 - Gas- or recoil-operation, e.g. selection of gas- or recoil-operated systems