I have a 2013 manufacture 75B that has over 30,000 rounds through it. In reference to wear and tear I have observed the following:
- The slide stop which unfortunately is metal injection molded breaks just like clockwork every 8,000 rounds. Easy to fix, just slide a new one in. Interestingly enough the gun continues to run with the slide stop cross pin broken right in the middle and I don't notice it until I get home to clean the gun after a range session.
- The trigger return spring broke at 23,000 rounds and I replaced it with one from CZ Custom Shop. The new spring is a little beefier than the original so it will be interesting to see how long it lasts. It may last the life of the gun.
- The recoil spring seems to lose tension and the slide goes back into battery noticably slower about every 5,000 rounds so I replace it when I notice the slide getting slow to return forward.
- All other springs in the gun, except the recoil spring and trigger return spring I mentioned above, are still the factory originals and all seem to still work just fine. I use the wolff replacement recoil springs which are slightly too long so I clip about one and a half coils off and I file the ends to flatten the wire at each end a little so it sits more flat on the guide rod flange on one end and presses more flat against the inside of the dust cover at the other end.
- The extractor is still the original and it still works fine but probably because I make an effort to keep it clean. At every cleaning I spray gun scrubber in the space behind the extractor and in front between it and the slide. I follow up with several drops of oil in the small space behind the extractor and I work the extractor to distribute the oil. At a range session any powder residue gets dissolved in the oil instead of caking up on a dry surface and when I spray the gun scrubber during cleaning it blasts the muddy oil out from that area. I then replace with new oil again. I mix a little marvel mystery oil and automatic transmission fluid in with my gun oil because each of those chemicals has properties that make it dissolve the powder instead of letting it cake up.
- The two lumps at the top on each side of the trigger bar have worn down a bit and I don't know if this is what caused it but in double action mode the hammer would no longer go back far enough to get released and fall. I could only shoot single action after that happened. This was at about the 10,000 round mark. So I went to this forum and found the answer was to slightly file down certain portions of each side of the disconnector. I did that and the gun has run file in double action mode ever since.
So to sum it up after 30,000 rounds -
Recoil springs get replaced every 5,000 rounds, the slide stop cross pin that goes through the slot under the barrel breaks in half every 8,000 rounds, the trigger return spring broke at 23,000 rounds. Would no longer drop the hammer in double action mode at 10,000 rounds but that was fixed by removing a little material from the proper places on the disconnector.
I wish that there were solid steel aftermarket slide stops available rather than those metal injected molded original ones. Maybe Angus can have his people make some - in black and in stainless steel, pleeeease.