I have decided to sell my fully automatic Mini Uzi that was converted by Billistics. The dealer that I reached out to sent me ATF Form 4 to sign and return to him. He stated that he would send me payment as soon as he received the signed form. He also stated that ATF approval is currently taking 2 or 3 months and that once approved, the new Form 4 would be sent to me by ATF. At that point, I am to ship the Uzi directly to him with the Form 4. My question is: What options do I have if he doesn't pay me? Can I contact the ATF and have them undo the transfer? Will the ATF do that? Or will I be breaking the law because I am in possession of a machine gun that is no longer registered to me? Is there a better way to do this transaction? The dealer lives in another state.