A few years back (7-8?) CZ had a bad batch of
trigger springs obtained from an outside supplier. There were a number of failures. Except for that group of springs, trigger springs haven't been mentioned much.
The original
factory extractor springs were probably too weak, and when gunk built up under the extractor, the spring didn't force the extractor to close on the rim as tightly as it should. Wolff developed an extra-strength extractor spring and CZ later copied their idea.CZ has since upgraded that part with newer guns. (Just keeping the area in the slide where the extractor rests CLEANED OUT made the spring weakness a non-issue.) If you have an older CZ, get the upgraded spring from CZ or Wolff.
Slide stops have an "internet reputation" for failure, but you'll read about it a lot more than you'll ever experience it. It happens, but it's really rare. I've got a CZ-85 Combat with 10K+ rounds through it with no failures, and have owned and shot thousands of rounds through numerous other CZs without problems. When I first became concerned about broken slide stops -- based on Internet gossip -- I checked with CZ-USA. The head gunsmith at the time recommended a heavier recoil spring, but I've since come to believe that wasn't a good recommendation.
The design of the gun is such that the frame doesn't get badly battered by hot loads, and the slide stop only a little, so a heavier recoil springs doesn't do much to protect the gun's frame or slide stop; realize, too, that the hammer spring is also retarding the slide as the recoil cycle moves the slide back.
But, when the round has been ejected and the next round is being stripped from the mag, any extra force stored in the recoil spring must be handled by the slide stop alone when the slide returns. If you see spent cases being sent out of sight, then a heavier recoil spring (or a new standard weight spring) might be in order, otherwise, maybe not. Or, perhaps, a heavier hammer spring?
If you want to try
different weight recoil springs, check out
Wolff's Browning Hi-Power springs. The Wolff CZ springs are really springs designed for Witness and Tanfoglio guns, which have much larger-diameter guide rods. The Wolff springs "slop" around on the CZ guide rods, but they work, so it's not a problem -- you will see scrape marks inside the dustcover from that "slop". The BHP springs fit the CZ guide rod just right, and are now available in lighter weights more suitable for the CZ. (That wasn't the case just a few years ago.)
About the only other springs you might want to investigate are
hammer springs; lighter ones will help improve the trigger pull a bit, but I'd wait until the gun was fully broken in and the trigger has smoothed up before making the change.
