The Stan Chen max bevel mainspring housing is an excellent addition to any 1911 and should be considered mandatory for anything but a range gun. It looks like it would only help minimally compared the standard mag well opening but in fact it makes a big difference. The extra room decreases the chance of a fumbled reload. In addition to the substantial improvement in reload reliability it can be done at home by a competent enthusiast. Stan knocked it out of the park with this one.