Some years ago I put a little over 1000 rounds through a Glock 10mm pistol in a day.
Just for fun, I did before and after shots of normal wear points. The gun was cleaned for both the before and after pics.
The gun had 300-500 rounds through it at the start of the test.
Some of the colors turned out funny in the after pics but that's just because I'm a poor photographer.
There was some additional wear visible on the connector and some finish wear inside the slide. Also there was some additional visible wear to the front of the dustcover where it rubs on the slide. No other visible wear and certainly nothing anywhere that would suggest that the gun is a third of the way used up.
Below you can see the wear on the connector. That is not a critical portion of the connector and wear there won't be an issue until it progresses enough to weaken the part--which is very unlikely. Besides, it's a $6 part and easy to replace.
Below is the firing pin safety--no visible wear.
The picture below shows the peening that sometimes shows up on the underside of Glock slides. It's possible that it has progressed slightly, but it's not anywhere near bad enough to be a problem. If it does get bad enough, it can be corrected with a few strokes of a ceramic file.
Below you can see the finish wear to the inside of the slide. I'd say it's purely cosmetic, but since it's inside the slide it's not visible.
No visible wear to the locking block.
No visible wear to the slide rails.