Shop › SCO PISTON 1/2X28 SN SCO PISTON 1/2X28 SN $75.65 SilencerCo Piston, 1/2"x 28 RH, Osprey/Octane, Fits Glock 43, M&P Shield, Sig 938, and others with a soft shoulder AC1756 Quantity: Add To Cart Added! SilencerCo Piston, 1/2"x 28 RH, Osprey/Octane, Fits Glock 43, M&P Shield, Sig 938, and others with a soft shoulder AC1756