Shop › DEAD AIR KEYMO BRAKE .46 .578X28 DEAD AIR KEYMO BRAKE .46 .578X28 $90.00 Dead Air Armament Key Mount, Muzzle Brake, 45 Caliber, .578X28, Nitride Finish, Black DA160 Quantity: Add To Cart Added! Dead Air Armament Key Mount, Muzzle Brake, 45 Caliber, .578X28, Nitride Finish, Black DA160