I've built around 40 1911's. The #1 problem related to magazines is a poor mag! I gave each of my sons a 1911 for their 21st birthday, along with that a Wilson Combat magazine. You can get these from Midway Dillon or a host of other places! Costs between 30 and 40 dollars depending which grade you buy.

The problem and the RO's temp fix sound like the Mag Catch and the square hole in the mag don't line up properly. The problem could easily be either one. I had to take burrs off mag catches several times! (Jeweler's files are your friend! A Dermal Tool is your gun's worst enemy!)

Ivan