SilencerCo AC31 Osprey/Octane Piston 9/16x24 40 S&W Stainless Steel
This piston by Silencer Co. is made out of 17-4 stainless steel, and is used for .40 S&W caliber handguns. Made for the Osprey and the Octane, this piston features a 9/16x24 thread pattern.
