For what it's worth, I read a post on AR15.com where the poster had successfully modified a Mec-Gar CZ-75 compact magazine. The floor plate didn't look so good, and it wouldn't lock back on empty mag, but it fed and fired. So yesterday, I decided to try it myself in the store. Using a standard CZ-75 magazine and some dummy rounds, I held the magazine in place and manually cycled the slide. It fed and ejected, but didn't lock the slide back. I did it again using a Beretta 92 magazine and it was even better. The fit was much tighter, as in no wobble, and it did lock back without needing a new follower. I'll keep my eyes open for anyone actually cutting a new mag catch notch and see how that works. Mec-Gar is making a 15rd mag for the Ber 92 compact, so that might work with just a mag catch notch modification.