Shop › MAG KCI USA AR-15 5.56NATO 30RD POLY MAG KCI USA AR-15 5.56NATO 30RD POLY $10.99 KCI USA Polymer Magazine, 223 Remington/556NATO, 30 Rounds, Fits AR-15, Black KCI-MZ018-BP Quantity: Add To Cart Added! KCI USA Polymer Magazine, 223 Remington/556NATO, 30 Rounds, Fits AR-15, Black KCI-MZ018-BP