So in an attempt to solve the FTF and jamming problem with the Rio 3" ammo in the factory 4 rd mag, I reverse engineered a flat pattern cut out of the metal retainer at the back of the mag, only this one has longer tabs. I CNC cut it from some stainless sheet, then bent it to shape. I had to relieve some of the plastic on the mag to get it to fit, but fit it did. I thought that if the shell was held down for a hair longer as it traveled forward, it wouldn't hit the feed ramp and should cycle fine. It actually worked on the first try with just one in the mag, but loading it to 4 caused the