The week spot on the USP series is the firing pin. I broke mine third round out of the holster at the range after running it a couple of years. The back half hit me in the face. We broke around 5 or 6 out of 320. They would break around the firing pin block. Supposedly this weakness was discovered as well with the testing done by CBP and addressed in the P2000, in their earlier trials. I am not aware of anyone breaking one in the HK45.