I wonder if "new" means "new". I don't want to get into dealer bashing as I know too many ethical and honest dealers, and factories do make mistakes.
But problems can also occur between the factory and the customer. I have seen gun shop employees take guns from the case and try them out, damage them, and then return them to the case without telling anyone. I have also seen customers buy guns, damage them, then return them with some excuse without telling the dealer of the damage.
And that doesn't even address the "new" gun bought "on the internet". I saw a Model 29, advertised as brand new on an auction site, that looked fine - on the left side. The right side looked like it had been dragged across a concrete road. The buyer watched as his dealer took the gun out of the box, and went berserk. No hope, though. The seller had closed his e-mail account and disappeared.
Jim