I have not been having good luck with selling guns lately. Had one come back "stolen" which it was not, but someone did paperwork wrong years ago on it. It all worked out fine and easily but still sucked. Now I sold a rifle and the buyer says he noticed it had a cracked receiver. He sent it back to the maker who replied with; Our inspection revealed that the damage to this rifle was caused by a cartridge case failure. Our warranty does not cover damage caused by defective ammunition. The receiver has been cracked and the barrel was found to be in very rough condition. The technician has deemed this rifle is un-repairable and has recommended replacing it. I have been authorized to offer you a replacement at the cost of $500.00. I bought this gun used in at a gun shop several years ago and shot it a little right after I got it. I did not have any problems with it and sat in the safe most of its life which is why I sold it. The gun is a ~$1400 gun and I sold it for $1150. I forgot to include the mag when I shipped the gun. Then I ended up out of town and forgot to mail the mag for over a week. So to make up for it I sent 3 extra mags worth about $50 to him. Now here is the question. I have no doubt the gun is broken. I didn't know it was broken when I sold it or I would not have. I feel I need to do something but I also don't feel like I should have to pay the $500 either. I have an idea of what I should do, but I would like some other opinions first.