SilencerCo Hybrid ASR Muzzle Brake 5/8x24 .338 Caliber Black. These Muzzle Brakes & Compensators offer quick and easy one-hand-on one-hand-off attachment and detachment letting you swap easily out in the field without bringing along a variety of tools. The 3-port design of the Hybrid ASR Muzzle Brake effectively reduces felt recoil and muzzle climb. Each ASR muzzle brake comes with a shim set and rocksett for easy application. Specifications for SilencerCo ASR Muzzle Brake: Manufacturer: SilencerCo Color: Black Fabric/Material: Steel Features of SilencerCo Hybrid ASR Muzzle Brake: Resonance suppression Compatible with ASR mounting system Package Contents: SilencerCo Hybrid ASR Muzzle Brake SilencerCo AC857: Hybrid ASR Muzzle Brake 5/8x24 .338 Caliber Black