Great question.
Sorry, I don't have the weights that your are wanting, but I too am trying to make my contender carbine as light as possible, and I am needing an old style, G1 stock for it.
I haven't heard of a brown precision kevlar contender stock, or a carbelite contender stock, where can one get these?
I have even coonsidered making one. I had made an encore stock fromm yew wood, nice and light wood.........but the dust I inhaled just about killed me