I just finished installing the Magguts +1 conversion on my 2 PM9 magazines.
I needed the swear jar next to me when I had to fight with that flat spring getting it in and the base plate on, but I prevailed.
I have another 6 round mag coming that will get the same conversion. I have these for my 9mm Shield and they work perfect.
One of my mags has a finger extension on it that I don't like because it sticks out too far. I ordered a factory metal replacement for it from Kahr.
It should be good to go by next week. Love this pistol!