This one looks "advanced"
This one looks traditional
Those were AWB-compliant "thumbhole" stocks.
Remember those monstrosities that liberals foisted upon us for a few years after their '94 ban?
Yep. I had one just like it back then. It's long gone now. It tossed that ugly abomination and attached a proper pistol grip and normal stock that I picked up at a gun show, unaware that in doing so I was committing a significant crime. Turned it in to a great little rifle though.