How old are your PM9 pistols? I purchased one a few months ago for steel challenge and it has been nothing but trouble. I have an STI Spartan 9mm and it runs like a top. My PM9 has gone back to Dan Wesson (the slide was hanging on the disconnector). I have 10 round Wilson mags that I use for both pistols. My STI also seems far more accurate than the DW. What mods did you make (if any)?