SilencerCo AC26 Osprey/Octane Piston 13.5M x 1LH 9mm Stainless Steel
This piston by Silencer Co. is made out of 17-4 stainless steel, and is used for 9mm caliber handguns. Made for the Osprey and the Octane, this piston features a 13.5mm x 1 LH thread pattern.