Had feed issues with my 9mm. I tried a .020 higher magazine release, with no success. Decided to try a .010 lower magazine release. It corrected the feed issue by causing the bullets to hit the frame feed ramp lower, and deflecting the bullets upward at a higher angle, and not occasionally hanging up on the barrel ramp.
I didn't really want the magazine release drilled and tapped, so I put a brass 4-40 set screw in the hole for some bling, and checkered the end of the release. The catch and spring are included with the magazine release.