SilencerCo Osprey/Octane Piston 1/2x28 9mm, Stainless Steel - AC25

This is a replacement piston assembly for SilencerCo Osprey and Octane suppressors, designed for 9mm and compatible with 1/2x28 threaded barrels. Constructed from 17-4 stainless steel and heat-treated for durability, the piston contains the Nielsen device mechanism that enables semi-automatic cycling while providing female threads for muzzle attachment. The piston is easily interchangeable between different host firearms and calibers within the Osprey/Octane family.