Bought a CZ52 a few years ago, fun to shoot, cheap to feed, primitive operation with the heel catch mag release. The pin holding the slide catch has worked loose and then fails to hold the slide back, and the rear sight worked loose but it goes bang every time save one dud round.
I had heard about the brittle firing pins and would be interested in acquiring a replacement, especially one of the improved U.S ones, so far mine has been fine.