Machine gun ownership was not banned, but no NEW machine guns could be produced for civilian sales.
Thus anything (full auto) made after '86 can only be possessed by a civilian if they are a Class III weapons dealer, and only if the dealer can obtain a letter from a police or military department stating the dealer is acquiring the weapon for them to test/evaluate.
Once said weapon is acquired it may be transferred among class III dealers as a Post '86 Sample. It still may NOT be transferred to a non-dealer civilian.
------------------
Make mine lean, mean, and 9x19!