The achillies heel for these guys is the firing pin. buy a replacement and look up how to change it or pm me its very easy. Even I did it. these guys are getting harder to find. hope this helps
I second this advice. Upgrades for these surplus guns tend to pop up at peak importation (long past for CZ-52's) and then slowly dry up as stock dwindles. There's usually only 1 or 2 production runs on this stuff, so get it while you can. I personally got a replacement pin for mine from
http://www.gunpartswarehouse.com/cz52.htm as they seemed to have the best price, but several other outfits have them too. I just took out my original pin (which was still fine) and stored it just in case, and then installed the replacement pin. Went in great, and gives a lot of peace of mind (and on the off-chance that the replacement breaks, I've still got the original as a backup).
I still regret not picking up one of the 9x19 barrels for mine back when they were around and selling for $75
. The guns certainly have their quirks, but mine's been utterly reliable and is built like a tank.