SilencerCo AC31 Osprey/Octane Piston 9/16x24 40 S&W Stainless SteelThis 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 16"x24 thread pattern.
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