Lemme jump in here again... I recently bought a Colt 1911 in 9mm from a fellow CGN'er. I was jamming so I took it to my Gunsmith. He informed me that I had a 10mm slide on it! Hmmm. So I go back to the seller who explained he just bought the gun from a shop in ONT. A long story short...both the seller and the shop offered to kicked me some $$$ if I wanted to keep it or FULLY refund my $$$ + shipping if I chose that route.
Now that is the way to do business! Things can and do go wrong in deals BUT it is all about being a man of your word and delivering a solid deal.