SilencerCo’s Hybrid ASR muzzle brake makes changing suppressors a simple, one-handed, on-and-off operation. This 3-port muzzle brake works with SilencerCo sound suppressors that use the Active Spring Retention (ASR) mounting system, including Specwar, Saker, Omega, Hybrid, and Harvester Big Bore ASR silencers. .46" opening accommodates a variety of calibers Available with 5/8"-32 and 5/8"-36 thread pitches Stainless steel construction resists blast erosion Tough black nitride finish Comes with shims for easy installation When used alone, without a silencer attached, the SilencerCo Hybrid ASR muzzle brake effectively reduces felt recoil and muzzle climb to help you stay on target even during unsuppressed fire.