Interesting. Sadly, i can't share my opinion right now, but i have some questions regarding these packs:
What are the mods on "M727" and "M16A1E1" segments of demonstration video? They look interesing, would be nice to know their names
Why aren't you using SC 5.0 hands? Basically, they're an improvement of 4.0 hands, and they have shoulders too (or, how's that part called)
By the way, technically, a fully-automatic M16A2 would be designated as M16A3. Not that it makes your packs worse, though. I see, you have heard of IMFDB; not many people realize, that "M4" from HD pack is actually M727