Can you post a link for the directions? Can’t beat that for $5
Not much to it really. Just go to Walmart, go to the craft section. You can find acrylic craft paint in small 2 oz bottles for .99 cents. Pick out the colors you like in the Matt finish - dark brown, light brown, grey, green, etc.
Buy a pack of natural sponges - look for ones that are fairly open.
I spread aluminum foil to act as my “palette” and just squeezed out the different colors. Dip sponge in the paint, dab on cardboard to remove excess paint, and then dab the stock. You can apply one or two colors, and let dry, and then come back and add more.
Great part is, you can change up anyway you want. I didn’t do anything special afterwards, like spraying a clear coat. It has been very durable. If you dou scratch up an area - just grab another piece of sponge and some more paint.
It uses very little paint. 5 mixed color bottles could probably do 20 guns... lol