SilencerCo pistons are designed to be easily changed for different host firearms or calibers. These pistons are made with 17-4 stainless steel, then heat-treated for maximum durability. The piston is part of the Nielson device that moves and allows semi-automatic cycling for unlocking pistol barrels. Throw a Fixed Barrel Spacer on for fixed barrel applications. SilencerCo pistons also have female threading that allows attachment to threaded barrels.
Extended pistons are for firearms where the silencer requires additional length between the threaded barrel and the silencer.