Dear Mr. Rawles:
As an addendum to the Friday piece on "Camouflage Painting Firearms" by Kyrottimus, I recommend this piece: Weapons Painting 101, a bulletin from the US Army TACOM detailing the officially-approved techniques for painting small arms.
Cordially, - John N.
Regarding "Camouflage Painting Firearms", you may want to point folks to this rather well-illustrated tutorial on painting your AR in the Multicam pattern, found over at AR15.com: How to Multicam your rifle...on the cheap!
Regards, - T.