Re: camo painting stocks
The sponge method is easy. Just spray paint the base color (usually the lightest color) then after that has dried some use a sponge to apply the other colors.
I use Rustolium camo paint and a regular 3/4" thick cleaning sponge. cut a 1" square piece of sponge, tear the sharp edges off, make a few deeper holes by tearing and you are ready to go.
Use an edge of the sponge, spray some paint on a paper plate, dab the sponge in the paint cleaning off the excess by dabbing on a clean section of the plate, then apply to the gun in a random pattern. You can roll the sponge some as you apply the paint to get a larger pattern.
When I changed colors I used the same sponge. Spray paint dries quick so no need to use more than 1 square.
The first color I applied over the Khaki was the OD, I almost stopped there because it had the look of the WWII German camo.