What's funny is, I've heard 3 different years on the firing pin issue. 2001, 2003, 2005. Big Bore, where are you? You know the answer to that!
But, I have read in a couple of sites, that "some" older firing pins were prone to breakage. And that a new upgrade pin alone, would not fix the problem.
Takes a few parts to solve the isssue.
I will look again for that info and post the site. Recommend snap caps on all dry fires (new or older guns)! That will solve the problem!
Going to research now!
Edit: HK did redesign the USP firing pins in 2005. They did not redesign them because they were made with bad metal, they redesigned them with more rounded edges to help eliminate breakage. Although it wasn't an epidemic, HK felt that they were having to replace enough of them under warranty that they should redesign them stronger. When upgrading to the newer firing pin, the firing pin block and firing pin block spring also have to be changed as they are different (same as P2000). I talked to Travis at HK today and ordered the parts to update my KF date code USP 45. I have an AB date code USP 45 that I will upgrade at a later date. The parts did not cost that much and if you have the know how to do it yourself, it will only take about 15 minutes or so to replace all those parts. Although what I stated in earlier posts was not totally wrong, I just wanted to get the proper info out on this subject.
202624 Firing pin (new style)
214190 Firing pin spring
209313 Firing pin block (new style)
209296 Firing pin block spring (new style)
980838 Roll pins (not a bad idea to install new ones and have extra)
I found this post under our forum!