The seventh round is very difficult to get into the magazine
I put about 115 rounds (S&B 115gr ball & 115gr Federal Hi-Shok jacketed HP) through the magazine and had one issue where the slide locked back with a round in the magazine. This was likely a user error.
Everything else went without issue except that my PM9 is not yet broken in and could be technique sensitive when sling shotting from a locked back slide. Done correctly it was no problem: be a little sloppy and I'd have to give the slide a quick second pull which would always charge the gun. My MK9 didn't care how it was done.
Rounds would load via a locked back slide and the slide stop or via locked back slide and slingshot. They would also load if the slide was already closed then cycled by hand (surprisingly this was less sensitive to technique than sling shotting from a locked back slide with my PM9).
I'll be buying a couple more kits.
Regards,
Greg