This is EXACTLY why I've never sold a gun through the classifieds in the local paper.
To tell a related tale, a friend of mine is trying to rent out a house he owns in the middle of nowhere. He advertised it as a "country house".
Well, one guy asked if he could "get there in his Mustang?". Another couple asked if they could "bring their cows?" And last was the guy who brought his family out in the middle of a show storm to look at the place. Mind you the place sits down many miles of gravel, and sits atop a VERY steep windy hill that you can ONLY get up with four wheel drive. Trust me, I know because I used to live there.
Needless to say he almost killed him and his family in his two wheel drive truck.
Either way, hope you learned your lesson.
Deal with the public as little as possible.