Call me skeptical, but IMHO if you went through the necessary hoops to own a full auto weapon legally, you would have a pretty good idea what needs to be done.
Call the BATFE, they will be able to give you the No kidding answer to any of your questions.
“At the core of liberalism is the spoiled child – miserable, as all spoiled children are, unsatisfied, demanding, ill-disciplined, despotic and useless. Liberalism is a philosophy of sniveling brats.” — P.J. O’Rourke