Silencerco 3-port muzzle brake is compatible with all SilencerCo ASR Mounts and with multiple thread and caliber options, you can shoot suppressed for any demand. It offers quick and easy one-hand-on, one-hand-off attachment and detachment. The 3-port design effectively reduces felt recoil and muzzle climb. Each ASR muzzle brake comes with a shim set and rocksett for easy application. This model is compatible with the Specwar, Saker, Omega, Hybrid, and Harvester 338 ASR mounting system.