All of this talk about litigation, and the first thing you learn in Law School [HLS '78] is before you even think about filing a lawsuit, you determine your Damages! There is no chance you can prevail here in Equity through Specific Performance [e.g. The court makes her sell you the gun at the agreed price], because it requires the item be unique. In contract law any damages are doubtful; because you bargained for one thing [C Grade] and she had another [B Grade] therefore there was no "meeting of the minds" and no contract exists or can exist, where both parties are bargaining for two totally different items. Besides after practicing Law for 36 years, I better than most know, no one really wins in litigation, except the LAWYERS! I recommend to people if you get your money back a much better, quicker, cheaper, effective solution is to go on the internet REVIEW SITES, e.g. MerchantCircle, Yelp, Google Ads etc. and leave negative reviews. THIS COSTS THEM BUSINESS, WHICH COSTS THEM MONEY AND STUDIES HAVE SHOWN MORE AND MORE PEOPLE ARE READING THESE, WHEN THEY GET A PHONE NUMBER FROM THE SITE! Move on and get the word out. GOOD LUCK Jerry