Well, if you as the buyer feel sketchy about the sale, and he as the seller doesn't want to meet your criteria for the sale, you should probably look for another gun IMO.
"The bended knee is not a tradition of our Corps"-LtGen. Holland M "Howlin' Mad" Smith, USMC,1949
Have you forgotten yet? Look down and swear by the slain of the War that you'll NEVER forget. [Siegfried Sassoon,"Aftermath,"1919]