Shop › DEAD AIR XEMAX BRAKE M18X1.5 .338CAL DEAD AIR XEMAX BRAKE M18X1.5 .338CAL $90.00 Dead Air Armament Xemax Muzzle Brake, 338 Caliber, M18X1.5, Nitride Finish, Black DA154 Quantity: Add To Cart Added! Dead Air Armament Xemax Muzzle Brake, 338 Caliber, M18X1.5, Nitride Finish, Black DA154