I installed the grayguns SRT on my USP, and the slide does not go back on unless I press down on the firing pin block while putting the slide on. It appears that the grayguns control latch makes contact with the firing pin block (red arrow) which is preventing me from putting the slide on. Is it possible that I got a control latch that is out of spec? I noticed it's a little bit wider than the OEM HK control latch. My USP was made in 2019 (BK date code) if that helps.