I just sent the Glock 17 I shoot in weekly practice back to Glock a couple of months back. At around 150,000 rounds (the offical "weekly" count was 147,400 rounds, based on 300 rounds a week over about ten years, but I often shot more, so 150K is a better guess) the rear rail tab sheared off. Glock replaced the frame and rebuilt the gun. The only thing original now, is the slide, barrel and night sights.
The barrel has a pretty good smiley on it, and you can actually feel it if you run a fingernail across it. Bore is starting to show some marks, but they said it and the slide were fine.
I replace the RSA twice a year. Probably let them go a little longer than I should, but I have yet to have it fail "the test".
The only other parts Ive had go, were two trigger springs. One at around 90K. the other at 120K. Thats it.
Ive also been using about 20 of the Korean mags on a weekly basis for practice, for about 12 years now. I did change some of the springs out about five years ago with Wolff springs, when I was having some function issues and trying to diagnose that, but that turned out to be a worn out brass problem, and not a spring problem. Most of those mags still have the original springs in them.