Silencerco Piston Kit - Get your suppressor ready for maximum handgun compatibility with the Common Piston Kit. Includes 5 pistons for the price of 4. Black nitride finish for increased wear resistance and lubricity. What's in the Box: .578x28 piston 1/2x28 piston M16x1 LH piston M13.5x1 LH piston 9/16x24 piston Booster Assembly O-Ring pack M13 O-Ring pack M16 O-Ring pack Compatible with: Osprey Series Octane Series Omega K Series Hybrid 46 Omega 36M Hybrid 46M