It probalby would break in OK but test out another PM9 before you do anything. the slide should close when released by the slide lock lever. I wold pass on that particular PM9 for sure but I would certainly buy the PM9 if you want thr smallest and the best.

without shooting that particular PM9, one would not know if a few rounds out of it would loosen what ever is holding it up, which more than likely it would, The pre prepping ofyour new kahr would certainly help it alot..