Been trying to keep from doing this mod. basically a CUT down SBR and whittle a stock and two pistol grips. That with a 50 round drum would be fun.
Of course you could get a folding black plastic stock and foregrip and cut the barrel to 8". BUT GET THE BATF SBR Licence first!. Thats $200.
The name of the book is the Ruger 10/22 exotic weapons system. It's a book on how to convert to full-auto. This full auto conversion doesn't work from what I read, but the SBR tommy gun look is awsome.