Guys,
Just FYI, since even most shooters don't understand this...
There is no "license" required to purchase or own any full auto firearm.
You must live in a state which allows it. Most do.
You must have a clean record and pass an FBI check.
You must be photographed, fingerprinted, and submit to ATF an application for transfer of the gun to you, and that gun has to have been entered into their national registry prior to a cutoff date in 1986, when the prohibitionists got the registry "closed" (for now, at least).
When submitting the application with prints and photo, you also pay for a $200 transfer tax stamp and wait for approval. That used to take six months or so. Now it takes a couple weeks.
There is no additional annual fee, etc.
Some states have additional registration requirements and some don't. Mine, Ohio, doesn't; except that you must have it registered with ATF.
Most people think you simply cannot have a "machine gun". Not true.
And by the way, the same rules apply to suppressors, "silencers", except that they can still be manufactured and registered. MANY thousands are being made and sold each year, with the number rising annually. With some difficulty, such a legal sound reducer can be fitted to a Luger, although it is more difficult to make a reliable semiauto pistol where the action is of the locked breech, short recoil type.
This is quite an interesting subject, and some of you might want to check this website focused on nothing else.
http://www.silencerresearch.com/index.htm