CM Products RPM (Railed Power Mags) feature dual wall feed rails. No more jams due to thin, warped and bent 1911 feed lips. The CM Products RPM is at least twice the strength of regular feed lips and offers the smoothest feeding surface. The RPM also features a patented tactical RPM follower, laser welded stainless tube, and 19 coils of rocket wire spring. CM Products RPM Magazines are the ultimate high performance 1911 magazines. FeaturesDual Wall Feed Rails No more jams due to thin, warped, bent feed lips18 Coils of Rocket Wire Spring-guaranteed reliability