This is an excellent thread that helped me a lot when I started to kering on mine. Mine doesn't seem to have any issue with the 3 Tapco 10 round mags I have though... They are TIGHT at first on the sides, but a little working them and they were fine. I used a little 200 grit on them on the sides to bring down them down just a tad just to make them a little easier.
Murphy's Law - What can happen will happen at the least opportune moment