I have a chance to buy a Colt Magnum Carry. It was fired a few times when purchased new and has been a safe queen ever since. It has the blue case that and all the paperwork, hang tag etc. that came with the gun. It is in almost perfect condition with just a faint turn line. He wants me to make an offer. I don't know much about these, what would a fair offer be? I want to get a good deal but I want to be fair. Any help would be great.