I've only got the weights on the complete weapons with me, but hope that this helps anyway.
Lightweight tactical (w/ shorty A-2 stock) 6 1/4 lb.
M-4 (w/ M-4 HG & Stock) 6 3/4 lb.
16" Expedition (w/ post CAR stock) just under 6 3/4 lb.
16" CAR (w/ post CAR stock) 7 lb.
I know these aren't exactly what you were wanting to know, but when I can get back to the shop I'll try to get the upper weights for you.