AAC Piston - Interchangeable HeatTreated Piston for AAC Suppressors The AAC piston enables quick conversion of an AAC silencer for use on different host barrels by replacing the threaded piston at the rear of the suppressor. Machined from heattreated stainless steel with a beadblasted matte finish, the piston is built for wear resistance and long service life. Each piston is engraved with thread diameter, pitch and rotation direction to simplify correct selection and installation, allowing a single suppressor to serve multiple firearms without additional muzzle devices. Note: Not compatible with TiRant 9MHD silencers; verify piston compatibility and visually confirm baffle alignment after each change before firing.