Fits AR-15 style rifles with thread pitch of 1/2-28. Three large baffles with six side ports and no top vents direct muzzle gases to the side, away from the shooter. Effectively counters muzzle rise and recoil, minimizes felt muzzle blast. Made of 4140 steel with a manganese phosphated finish, measures 7/8" diameter and 2" length. Solid bottom minimizes dust printing when shooting prone. Easy installation, secured with the supplied lock-nut.