Originally Posted by RogerD
I tried to contact the seller but he now refuses to talk to me.


Originally Posted by RogerD
I paid by personal check sent by U.S. mail. I have the cancelled check. The amount of purchase was 400.00


Originally Posted by RogerD
Wow I just checked Gunbroker and the FFL dealer sold the same gun on 11/15/2012. What now?????


I'd say that he definitely owes you $400.

I'd try contacting him once more, with info on the auction where he later sold the gun, along with a copy of your cancelled check.

If no response, go to Gunbroker.