OK, so I now have just a little over 2K through the second gun. A 1,000 of that was Winchester WinClean (known for not being the most reliable ammo) and now a second PX4 has passed the 2,000 round test. So far the best hammer spring is the Cougar "D" spring. Gun has proved to be super accurate with everything I shoot in it and how I have a little over 6K through two guns and they have both been 100% reliable. Interestingly they both run the Winchester WinClean better than my 92 does. The WinClean gives me fits in the 92 pretty often. The PX4 Compact not only runs it well, it seems to shoot it very accurately also.
I have also heard that there are even more parts for the PX4 than I knew about. Turns out Beretta Italy has spent quite a bit of time developing some accessories for these guns. There are 4 different versions of the safety levers in different sizes. There are steel guide rod kits and even an improved trigger group. Basically it is a whole hammer and sear group that just drops into the frame that includes a better hammer spring. Both DA and SA are improved with this kit. I am trying to see if I can get my hands on one to try. This kit includes a stiffer cage that houses everything as well as plated parts for a smoother action.
Attachment 3685
So the project continues. So far this little gun is making me happy and doing everything I would expect it to do.