The FPRP needs to be softer than the firing pin to prevent damage to the firing pin (cheapest part wears out/fails first).
Does anyone know if the purpose of the FPRP is two fold? In other words, is it there to do the Retaining the Firing Pin in the slide job only? Or is it there to also provide the firing pin with a stop to keep it from protruding to far past the breechface?
If it is only a firing pin retaining pin then the firing pin should be stopped by the combination of firing pin return spring, OD/taper of the firing pin shaft at some point and ID/taper of the firing pin channel in the slide.
If the FPRP is not there to control forward movement of the firing pin then there should be no damage to the FPRP from firing/dry firing - to me it means something is out of wack, a bit.
Some of us have commented about pistols we own that damage FPRP and some that don't.
I realize nothing mass produced is identical. It can't be.
I don't know what pin is best. I don't know what the dimensions on all the component parts are but I'll bet they have QC specs with a range from low to high. We've all seen/heard/read about "tolerance stacking". That combination of "in specification" parts that when parts near the low or near the high end of the spec. end up installed together can cause function issues, accuracy issues, parts breakage issues, etc. It happens. Always has, always will.
I haven't broken one yet. Seen some that were gouged up. Replaced several (all??) of mine with CGW pins that were cheap compared to the other parts I bought from them and installed at the same time I installed the other parts. At some point I may find myself replacing the CGW FPRP. If I do I'll be taking a closer look at the back side of the slot the FPRP sits in.
Just had another thought. I wonder what the effects of installing a reduced power firing pin return spring would have on FPRP damage? Maybe none at all, but consider the effects of replacing parts the factory installed designed to keep your pistol running for thousands of rounds (along with the knowledge that most people who buy a pistol will never shoot that many rounds). I know I sure don't know what to check (in many cases) to insure the replacement/custom part is going to work perfectly with the factory parts still in my pistols. Another reason why the little disclaimer on the CGW/CZ Custom web sites advise having a qualified gunsmith install the parts (which most of us, me included, ignore and do it ourselves anyway).
I'll bet the majority of "qualified gunsmiths" aren't well versed in what to look for/consider on CZ's like the guys at CGW/CZ Custom/CZ USA are.
Just some thoughts, right or wrong, I had'em and shared'em on this cold March morning. With my UG P01 sitting, loaded, in the basket by my chair. If I didn't trust it, it wouldn't be there.