I had a '94 Winchester carbine brought to me once that had a scab of deep rust at the muzzle beside the sight. I guess the hunter had poked an animal after it was down and not thought about it again. 20 years later...this was a major pit in an otherwise perfect finish. That took a minute to sort out. Another had blocked bushes with his hand as he went through and there were thorns in there. He took the rifle again by the balance and that's where the pits developed. Right where the blood was rubbed into the finish...