For full auto? I know that there's a program for an 80% receiver (plus the printer, of course).
Personally, I'd like it if it was at least nominally legal to own, since I'd rather avoid a SWAT raid on my home. Yes, I know, the law itself is illegal per the 2nd Amendment, but I don't have SWAT teams at my beck and call.
I Built This AK-47. It’s Legal and Totally Untraceable.
http://www.motherjones.com/politics/2013/05/ak-47-semi-automatic-rifle-building-party