Steel Crush Washer for neat fitting of muzzle brake / compensator to AR-15 or other 5.56 / .223 / .22 / 9mm rifles, carbines or pistols utilising standard 1/2"x28 or 1/2"x36 thread (it's really only the diameter - 1/2", rather than the thread pitch that counts with a crush washer).
Model: CMARMBCW
Picture shows correct install orientation.