Forget about it.
Too many ways and laws already on the books concerning the sale of proerty for this to work without 10 years of legal crap in court before it could do anything.
Selling my Gun to you is the same as selling my lawn mower. If the Seller doesn't care who the buyer is, it doesn't mean a thing.
Now, if you are a responcable gun owner pass the sale through an FFL if you have any doubt.