To the best of my knowledge 44Mag carries Promag. In my personal experience Promag sucks, and should only be used as range mags. The feedlips in the Promags Ive owned in the past weren't up to par. I have some Kahr Promags, but they are simply range mags. Ive got a few PM9 mags that I bought used for $20 ea at a gunshow(gotta look for em I guess) planning to buy a PM9 someday, but havent gotten around to it. Im at the point where I have so many K9 mags I think I'll buy another "fullsize" first.