Shop › DEAD AIR XEMAX BRAKE M18X1 .338CAL DEAD AIR XEMAX BRAKE M18X1 .338CAL $90.00 Dead Air Armament Xemax, Muzzle Brake, 338 Caliber, M18X1, Nitride Finish, Black DA153 Quantity: Add To Cart Added! Dead Air Armament Xemax, Muzzle Brake, 338 Caliber, M18X1, Nitride Finish, Black DA153