Overview Reviews Product Description Dead Air Armament Key Mount, Zero, 30 Caliber, 1/2X28, Nitride Finish, Black DA320 Product Videos Product Reviews Write a Review Write a Review × Dead Air Armament DEAD AIR KEYMO ZERO 1/2X28 .30 CAL Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *