I have a Glock 22 that was a LE turn-in. It had some holster wear, and some noticeable but mild internal wear.
I don't know how much it was shot. I'd guess not a whole lot, but not barely at all, either.
I've shot it quite a bit in the 3-4 years I've had it.
It still functions perfectly, just like the day I got it.
I have a 9mm barrel and mag for it, but the 40 caliber ammo is more fun to shoot.
I'm guessing I will give out before it does.
It was a ridiculous deal, too, like $300 OTD with the box and 2-3 extra mags.