I think I used Rustoleum flat camo from Wal-mart, black and tan. It might not the best stuff to use, but it looks kinda cool, and is a little more protected than it was before.
If you do this, make sure you don't go super thick on the magazine tube, or you'll have a hell of a time putting the fore-stock back on haha.
I think I used two coats of paint, and I still had to sand the inside of the fore-stock to make it fit.
Diffidently a fun project IMO.