Use this crush washer during the installation of a flash hider, muzzle brake or compensator on a barrel. Just place on the barrel, then thread on your comp / muzzle brake / flash hider and torque to 15-20 ft-lbs. .730 inches outside diameter.
DB15 .223/5.56 MUZZLE BRAKE -MADE FROM 4140 STEEL WITH A BLACK OXIDE COATING -2 SIDE PORTS ON EACH SIDE AT THE 3 O'CLOCK AND 9 O'CLOCK POSITIONS -4 SMALL PORTS ON TOP AT THE 12 O'CLOCK POSITION -WEIGHT: 3.2 oz -MADE IN THE U.S.A.