I'm the only one here that trusts a gun before 500 rounds?
I've shot and owned a few lemons before and the problems were apparent in the first mags, always felt I probably failed to find that gun's favorite ammo.
i carry a revolver for my ccw so theres a 99% chance i'm not going to have a feed jam problem--however there is always the chance something internal could break or you get a bad round. I have yet to ever have a centerfire factory round go off, but I think 500 rounds is acceptable.
I give mine 500 rounds of endurance firing (rapid, strong hand, weak hand, anything to make it flinch) before it gets the green light. If there's a flaw in the metal or parts, sometimes they don't become evident for a while, I feel more comfortable in giving the weapon a period of time to prove itself before I trust my life to it.
I voted 100rds but for new autos I use the old standby of 200 rds, the second half of which the gun needs to be flawless. Now this total may or may not include testing carry ammo for reliability in a given gun.
I voted 500, but I'm still undecided on the subject. When I first started carrying, all I had and could afford was one pistol. I had shot it over 1000 rds before I received my permit, without a failure. If there were a malfunction, having one shot would have to be better than having no shots.
I'm comfortable with 100 rounds with 100% performance. One malfunction, ever, and it immediately becomes suspect. Another malfunction, if I'm sure it's not an ammo problem, it either goes to my gunsmith, or back to the maker. Fortunately I've only purchased two firearms that failed, one was replaced by the maker, the other was traded +$ for another brand.
All guns are mass produced machines, which means they can all fail. With proper maintainance I expect 100,000 miles from an automobile, and a lifetime of reliable firearm performance.
I voted 100 rounds myself, but I will add that it needs to be reliable with the ammo I will carry as well. After the gun is deemed reliable, I will run a box of the carry ammo thru to make sure there are no problems. I don't know, maybe you can wear a gun out by making sure it's reliable. I ran 75 rounds thru my keltec before my hand gave out, and for me that was enough. I didn't want to shake the thing apart before I started carrying it. I probably still have less than 250 rounds thru it.
Another way to look at it: A person buys a gun. It's their first gun. They want it for home/self defense. Should they have to wait to run 500 rounds thru it before they put it on their nightstand? The gun costs say $350. Then there's the cleaning kit etc. 500 rounds is $150 on average, plus the several range trips to shoot it, range time, targets, etc.
Ultimately, the more it performs reliably, the more I will have in it without question. But like the man said, it could break at round 501