Earlier quoted context omitted.
No, it takes a semi-auto 80% receiver and finished the remaining 20%. (And after that, "Some assembly is required," e.g http://www.brownells.com/.aspx/lid=11004/learn/ .) But if you want to be concerned, look at how utterly simple a full auto (simpler that way, e.g. firing pin is a bump in the bolt face) 9mm Sten gun is: https://en.wikipedia.org/wiki/Sten (A semi-auto AR15 is a much more capable weapon, BTW.)
What's darkly funny to me is that those things are illegal. Perhaps the biggest event in favor of keeping such weapons outlawed was the North Hollywood shootout ( http://en.wikipedia.org/wiki/North_Hollywood_shootout , basically IRL Payday), and yet only two people--the robbers--were killed !
ADDED: per the NRA's page on California gun laws, in theory its even legal to have and transport one, although evidently the permits to do so are never granted (well, I assume except for Hollywood...).
2 known illegal uses of legal machine guns in private hands in the US ... one by a cop....