This is a Thunder Beast Arms Corp 223CB (Compact Brake) muzzle brake. It features a 1/2x28 thread pitch for .223 caliber with Ionbond DLC finish. This brake was designed for use with TBAC CB-series suppressors, including the Ultra 9, Ultra 7, Ultra 5, 30CB9, 30CB7, and 30CB5 models. It is also compatible with older 30BA and 30BAS suppressors when paired with the CB2BA adapter. Compared to the previous BA muzzle brake, the CB brake is smaller in size and delivers up to 40% greater recoil reduction. Peel washer included. Buy online today!