Mario,
actually the stock is green, but looks like black because it's a bad pic with poor lighting. I took one of the forearms to Home Depot and they mixed a small can of green stain to match my green furniture. The green on the stock is a darker shade, but it still came out looking good. I then sprayed a few layers of verathane (or something like it) to help protect it the stain. One of these days I need to take a better pic of it so people can see what it really looks like.
Dan