If they were made before 1986, they should be transferrable on a form 4.
Transfers are under control of the National Firearms Act and thorugh Class III dealers.
The question is, were the guns registered prior to 1986, and I have not seen facts on that...
Here's an article:
http://www.thefirearmblog.com/blog/2...ide-full-auto/
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.