Shop › DEAD AIR KEY MNT MICRO BRK 5/8X24 DEAD AIR KEY MNT MICRO BRK 5/8X24 $89.00 Dead Air Armament Key Mount, Muzzle Brake, Black, 5/8X24 Threads, .38 Bore DA111 Quantity: Add To Cart Added! Dead Air Armament Key Mount, Muzzle Brake, Black, 5/8X24 Threads, .38 Bore DA111