Colonel Mustard muzzle device. The quality of these brakes/devices are on par with the brakes we carry from our Canadian-made suppliers. Screws onto standard AR-15 / M4 ½" x 28 threaded barrels (with .223 / 5.56 bore). Includes crush washer and jam nut. CMMB242556MB.
Part Number: CMMB242556MB