Rugged, all-steel, high-capacity magazines for 9mm AR-15 conversions that use a Colt-style magazine. Metal follower won't distort under a full load and aids smooth, reliable feeding. Hold-open feature works with ARs fitted with hold-open on the conversion block. Easy-to-remove floorplate makes disassembly fast and simple. Fits Colt and Rock River conversions with a lower receiver conversion block. Mfg: Metalform SPECS: Steel, black glossy finish (20 round).