SWglockmagnum, If it was made after '86 you can't own it. Well, you could if you were a class III dealer and had a demo request letter from a law enforcement office... But you aren't and you don't so you can't.
There are also no transferable machineguns that were imported post '68. All imports from '68 to '86 are dealer pre-samples. Again, it is a dealer sample and you can't own it. If a semiauto gun was imported and registered and converted to full auto in the U.S. between 68 and 86 it is transferable and you can own it.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.