AAC Blackout 18 Tooth M4-1000 Muzzle Brake 5.56mm 1/2-28 TPI

Proprietary features eliminate muzzle flash even on CQB-length barrels. Inherently stronger and more impact resistant than four prong designs while not being subject to the rapid erosion of closed-ended units. High strength corrosion-resistant aerospace alloy and ultra-hard SCARmor finish provide the highest level of durability. Military tested and selected.