How to install a muzzle brake or flash hider using a crush ...
Place the crush washer over the muzzle threads, then thread the muzzle device up against the crush washer, hand tight. Using a wrench, socket, or other suitable tool, Turn the Brake 1/4turn/90degrees PLUS enough to clock it properly. (Proper crush washers are machined from spring steel and will compress, and at 1/4turn will reach and maintain a ...