I am trying to find some good reliable mags for my Colt 9m/m AR Carbine. Factory Colt mags are hard to find and sometimes quite expensive. Are the Metalform mags made to the same specs as the Colt factory mags? I'm trying to stay as close to factory as possible because I ordered some polymer aftermarket mags that won't lock into the magwell, so they're useless. Wanna kill these ads? We can help!