Shop › MAG KCI USA AR-15 5.56NATO 50RD DRUM MAG KCI USA AR-15 5.56NATO 50RD DRUM $89.99 KCI USA Drum Magazine, 223 Remington/556NATO, 50 Rounds, Fits AR-15, Black KCI-MZ036 Quantity: Add To Cart Added! KCI USA Drum Magazine, 223 Remington/556NATO, 50 Rounds, Fits AR-15, Black KCI-MZ036