This 3-port muzzle brake is compatible with all SilencerCo ASR Mounts. 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.#html-body [data-pb-style="62DF828932AE9"]{justify-content: flex-start; display: flex; flex-direction: column; background-position: left top; background-size: cover; background-repeat: no-repeat; background-attachment: scroll; border-style: none; border-width: 1px; border-radius: 0px; margin: 0px 0px 10px; padding: 10px;}#html-body [data-pb-style="62DF828932AF6"]{border-style: none; border-width: 1px; border-radius: 0px; margin: 0px; padding: 0px;}