If you've never broken a gun, you just ain't shooting enough!
Extractor on Colt GM and Charles Daly EMS each ~8000 rounds. Replaced myself. Both been fine for a couple thousand rounds since
Link on RIA at about 3500 rounds, over 9000 more since the repair (did it myself) with no issues since.
Slide cracked on EAA Witness 10mm Compact <300 rounds. Replaced under warrenty. About at the point where it cracked now, should pass it next time out with it.
Kahr CW9 frame rails warped on first box of ammo. Repaired under warrenty been fine since, porbably a bit over 2000 rounds thru it since its return.
Keltec P3AT assembly pin walked out and boogered up the frame before I noticed it, gun kept shooting despite the damage, had a couple of hundred rounds thru it. Replaced under warranty, fine for ~800 rounds so far.
S&W M22A "hook" at the back of the frame broke somewhat over 1000 rounds, causing 50+% mis-fire rate. Repaired under warranty, probably over 5000 rounds thru in now
I won't mention parts than were bad out of the box.
--wally.