I've read up on the thumbhole stocks... That one is pretty much a skeleton grip, which may or may not be legal based on the NJ definition.
Believe me, if I can get away with it, i'd do it, but not looking to jail here over it.
Again, looks like I'd have to get a thumbhole stock and get it to the FFL who would be getting the VEPR and have them make the mods. Oh the joys of NJ.