That is a great article with lots of good information.  I bought mine and have nothing but praises for my PF9.  I have had many P3ATs and all were great, too.  Another great pocket pistol; won't, of course, replace my R9, but it does have it's place.  I installed the P11 metal guide rod and the pinky extension which really helps.  Hope Keltec gets some night sights as I am partial to them.  I'm out.