That's a very good point...

ToddG called a halt to his endurance test of the Gen4 Glock 17 at 71,260 rounds due to a bit of odd wear on the breechface. The gun was still functional and, per Glock, probably had at least another 10,000 rounds in the slide (and Glock would no doubt replace the slide at no cost,) but since Todd uses his test guns as CCW pieces, he ended the test rather than continue carrying it.

Nothing out of the ordinary there, and I wasn't going to mention it until someone made a comment over there that I thought was worth repeating:

It is also notable that the steel slide wore out before the polymer frame, which were once thought to be too fragile.

The "plastic frame" thing should have been laid to rest years ago, but it somehow stays alive in internet forums, the dustier corners of gun shops, and way out on the far lanes at the club range. One is certainly free to question whether a polymer frame will last a hundred years, as the oldest ones are only a third of the way there, but I'd say the question of whether they'll last a hundred thousand rounds is well settled.