Sorry to those who posted and I haven't visited this post for a while. I have an article about painting camo onto a rifle on my predator website. I can try to post it on here if ya'll would like. It is outlining how to put a "Krylon" paint job on, but the concepts apply to any style. The digital camo is applied in layers with a lot of stencil work. You first have to spray it with a solid color and then apply stencils to that and then shoot it with another color and then peel those and come back to it with yet another color and female stencils to put on the three color digital that I did on the above rifle.
Here are a couple more pics of another gun that I just finished putting a DuraCoat finish on. When my new 6mm WOA gets finished I think I am going to paint it up similar to this AR15 that I just sold to my buddy.
The following two pictures are done using the Krylon process that I mention. Krylon won't last even remotely as well as DuraCoat, but it is pretty cheap and you don't need a lot of special tools to put it on.
Here is the end product from the article that I mentioned.