Pretty sure you'd need a class III to buy one and you'd have to pay the mang a $300 tax stamp on top of the sticker price.
Full auto would cost even more.
I think they're $600 tax stamp now.

Pistol with a stock or short barreld rifle, whatever you want to call it it's illegal to carry or even own without a federal licence.

Might as well buy a folding KelTec 9mm rifle and own it leagally.

Looks cool though!