Oh yes, please check out the video of the Knob Creek FULL-AUTO machine gun shoot. http://www.youtube.com/watch?v=Qd0ppORwBog
I’m sure the ATF would be fascinated at the thought of so many ILLEGAL machine guns in one spot.
It is legal for civilians to own machine guns that were placed in the national registry prior to 1986, and has the appropriate tax stamp. However, no new firearms can be placed into the registry.
This is why a full-auto AR rifle, which doesn't cost any more to manufacture than a $1,500 semi-auto AR, goes for $10,000 or more. There is a fixed limited supply of them.