Features: Rugged heat treated steel magazine body Durable steel follower Matte black Xylan coated magazine body Xylan coating drastically reduces friction and provides excellent corrosion resistance Bolt hold open tab Easy to remove floorplate allows for quick maintenance and cleaning Round count indicator windows allow for a quick assessment of remaining ammunition Fits AR-15 rifles that accept Colt style magazines Mfg: Brownells SPECS: Fits 9mm AR-15 rifles that accept Colt style magazines. Body - Steel construction with a matte black Xylan finish. Follower - Steel, round. Spring - Extra power steel. Floorplate - Removable steel.