Never had a P-11 but had a PF-9 and a sub-2000. Shot the snot out of both of them and never had a problem. Slide on the PF-9 started to rust (pocket carry). Thought enough of it that I had the slide nickel plated. It was just a touch to big for pocket carry and sold it. The sub-2000 was in 40S&W. If it was 9mm I'd still have it.