madbadger: I dang well sympathize with you and agree with what the Shootingamigo advises.
I would call the guy once more and let him know how concerned you are that he hasn't yet shipped the handgun. I would give him the chance to explain himself. Then, if you don't buy his excuse, give him a deadline by which he must ship it. If you do this by e-mail or follow-up on your telephoen call to him with an e-mail request, copy your message to him to your local Sherrif or Chief of Police (that always worries the heck out of someone) with the request for them to follow-through with federal authorities on your concern. Just let your Sherrif or Chief of Police know what you are going to do before hand so they are prepared to act on your behalf if the guy sours up.
I would like to think that would get something moving...... And, btw, when you get the gun, if you, the Shootingamigo and me all go to the range together and become friends, will we be the Three Amigos :-D .......HTH. Mikey.