Add some firepower to your AR-15 with this gun magazine from Promag Industries. This is a 42 round .223 polymer gun magazine that comes with a lifetime guarantee. This ar-15 magazine body and follower are made of DuPont Zytel and it uses a Chrome-silicon heat treated wire spring for smooth feeding. Manufactures part number COL-A22B. Gunclip Depot has the largest selection of AR-15 gun magazines and gun clips. If you do not see the gun magazine you are looking for send us an email and we will try to locate it for you.