The original BC1.5 has identical performance to all of the 5.56 BattleComps, but has been extended and pre-drilled for permanent attachment on 14.5″ barrels needing 16.1″ overall length.
Professional installation is required. A competent gunsmith will custom fit any needed pin through the #7 hole, so no pin is included. The overall length of the unit is approximately 2.15″ long and weighs 2.0 ounces.
It fits all barrels with 1/2×28 RH standard threads. Specifically designed for 5.56 NATO and .223 Rem ammunition. ALL BattleComp units are California Legal Compensators and have been since May of 2010.
Crush washer included.