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With a Glock, my take on it is "if it ain't broke, don't fix it." They're incredibly high-service life pistols, with very few moving parts. The only things I've seen fail on a regular basis is springs from use -- and I'm talking about competition guns that see 10-15K rounds a year and countless thousands of dryfire cycles beyond that. Even then, it's just the occasional recoil spring and/or firing pin spring--usually reduced power firing pin springs don't last as long.

If it goes bang every time you pull the trigger, feeds and ejects smoothly, and doesn't leave a smudge trail everywhere you set it down, I'd run a bore snake through it, add a couple of drops of oil to the moving parts, and leave it be. Usually with Glocks, if there is a problem, it's obvious...not subtle.

The only problems I've ever seen with Glocks stem from modifications of various types (competition/light trigger work, weird combinations of springs intentionally put in service for specific purposes, etc.) and not from the standard "glock approved" mods like changing out trigger connectors and such.

I've seen Glocks "quit," but trust me, it wasn't "normal" wear!