I'd estimate I've put about 20,000 rounds through it, but don't forget the problem with the slide is no doubt of my own making - using the slide stop to release the slide instead of pulling the slide back and releasing it. At 5 rounds per magazine, that's 4,000 times the back of the slide stop scraped down along the bolt and adjacent slide rounding it off. And all those scrapings were unnecessary.

Regards