Purchased a first year production Colt .38 Super from an old gent that had a chicken farm in southern Illinois. He had bought it new and only fired it one time, at a coyote about 20 yards away, dumped the whole magazine and did not hit him one time.
He put it away and never shot it again. When I went to clean it up before putting it out for sale, I found it had a .45 bushing with the skinny .38 barrel! No wonder he missed the coyote, it was a Colt factory goof from 1928!
Late 1980’s, sold a guy a stainless Colt government model, he shot it and put it away in his safe and did not look at it for a few months. When he took it out the slide was rusty red.
Somehow an un-blued government slide got mixed in with the stainless ones, Colt replaced it under warranty.
Got an S&W model 22-A in 2 or 3 years ago, S&W forgot to rifle the barrel.
After a few weeks we could find nobody that wanted to pay a premium for it so we sent it back to Smith for a new barrel.
A Chinese surplus SKS had the chamber cut in such a way that it was about 1/8†deeper than it should have been, guy brought it back to show me how odd the fired empties looked.
I gave him another gun.
After almost 20 years selling guns I am sure there are others I have forgotten…..
Didn't even think, just made the bid on seeing the rifle. 
