The SilencerCo AC31 Piston is a 9/16x24 suppressor piston for compatible SilencerCo pistol suppressor systems. It allows the suppressor to interface with host firearms using the 9/16x24 barrel thread pattern.

SilencerCo pistons are designed to be swapped for different host firearms, calibers, and barrel thread patterns. They are made from 17-4 stainless steel and heat treated for durability under repeated suppressor mounting and cycling use.

9/16x24 Thread Pattern: The AC31 piston is the 9/16x24 version. This thread pitch is commonly associated with select .40 S&W and other compatible threaded pistol barrels, but thread pitch should always be verified on the actual host firearm before ordering.

Nielsen Device Component: A piston is part of the booster/Nielsen device system that allows many semi-automatic tilting-barrel pistols to cycle properly with the added weight of a suppressor attached.

For Compatible SilencerCo Suppressor Systems: SilencerCo pistons are commonly used with compatible pistol suppressor families such as Osprey, Octane, Omega K, Hybrid 46/46M, and Omega 36M configurations when the correct piston mount or booster assembly is used. Always confirm compatibility with your exact suppressor model before ordering.

Fixed-Barrel Host Note: Pistons and boosters are generally used on tilting-barrel semi-automatic pistols. For fixed-barrel hosts, use the correct fixed-barrel spacer, fixed mount, or manufacturer-recommended mounting configuration for your suppressor and firearm setup.

Important Fitment Note: This AC31 model is the 9/16x24 piston. Always confirm barrel thread pitch, suppressor compatibility, host firearm action type, piston family, bore alignment, and manufacturer instructions before installation or live fire.

Related Gear: Browse more SilencerCo products, shop additional silencer pistons and boosters, or pair your compatible host with 9mm Ammo.