Shop › DEAD AIR KEYMO BRAKE .46 11/16X24 DEAD AIR KEYMO BRAKE .46 11/16X24 $90.00 Dead Air Armament Key Mount, Muzzle Brake, 45 Caliber, 11/16x24, Nitride Finish, Black DA163 Quantity: Add To Cart Added! Dead Air Armament Key Mount, Muzzle Brake, 45 Caliber, 11/16x24, Nitride Finish, Black DA163