I think (think) that it's a "Paratrooper" model, and I don't think there's a D model of that type.
They do need to have a high US parts count. I don't recall exactly which parts were best to swap out, but I do remember that you're supposed to put one of those spring-loaded firing pins in it to prevent the infamous SKS slamfire, so that's one. If the foreign parts count is <10, then it's in compliance with the 1989 import ban. IIRC, there was something about the bayonet making it impossible to keep the parts count right (or something else equally stupid), so you're not supposed to put the bayo on it. I know, it's lame.