American Defense Mfg. 0DM4, Semi-automatic Rifle, AR, 223 Remington/ 556NATO, 16 Barrel, Matte Finish, Black, 30 Rounds, 1 Magazine ADM4R5BLK16M1MLOK Built on a billet aluminum, fully ambidextrous upper and lower receiver set, the ADM4 is built the to the same specifications as their standard UIC Mod 2, but features a slick sided magazine well.