With the slide is locked back on an empty mag, press the magazine catch. How far, if at all does your empty mag drop.
On my pm9, the mags used to slide out about an inch, but recently they will only move about 1mm and that's it (same thing for 4 mags). Looking up the mag well, I can see that the trigger bar presses against the side of the mag. If I press the trigger a bit, it moves to the right and the mags will drop freely.
I've been going around and around with Kahr over what "factory spec" behavior is or should be. IMO, if I need to do an emergency reload, the mag should drop at least a little (say an inch) to give me a little something to grab. With my 6 round mag, I have to grab at the little baseplate with my finger nails to get purchase on it, not something I expect to be able to do under pressure.
I understand there must be some spring force against the slide release to get forceful ejection, and that with the slide open, the slide release is raised there isn't much spring compression. But I'm thinking that the trigger bar is simply interfering too much.
FYI, this post on pistolsmith.com indicates a similar problem, but I haven't had any luck figuring out if person's issue was resolved.