I don't have any Beretta or Mec-Gar mags to try out (other than the "Mec-Gar for Girsan" ones that it came with) so if anyone is a member of the EOSC and has some they'd like to try, maybe we can arrange to meet up at the range and test a few. It'd be good info to know. Same goes for grips for the folks that asked. I'm willing to use mine as the guinea-pig to see what Beretta and after-market bits work on it and report back.
Glad that other folks are getting into these. You can't beat the price/quality on them.