Originally Posted by undy
Note to self... keep my right thumb off the magazine release button while firing and keep it just under the slide. I need to make that a habit. I honestly think most of my mag drop problems was this.
Not having a Micro 9, I don't know how feasible this is, but maybe it will help.
I have a little Kahr P380 that fills a particular roll for me. I was great, except that once in a while I'd remove the holster and find that the magazine wasn't in place. The first time I attributed it to user error. The second time I became concerned. The third time it happened, I knew there was a problem that needed to be fixed.
The magazine release is in a typical 1911 location and functions the same way. Interestingly, the height of the mag release above the widest part of the grip is substantial. My theory was that the mag release was getting bumped or pressed during my everyday activities.
I removed the mag release and filed down the top of the button quite a bit. Now it sits about 0.020" higher than the tallest part of the grip. It still protrudes about 0.080" above the surrounding material, so pushing the release is still easy. I left the button flat on top and then hit it with a Birchwood Casey touch-up pen. My thoughts were that I could cut lines in it at another time, but it's been years and it's no longer a high priority.
The magazine hasn't inadvertently come out since filing it down. I can no longer do high-speed tactical reloads... oh... wait... this is a P380. Fancy John Wick style reloads were not a thing BEFORE the mag release modification.
Anyway, that's what worked for me.