Re: paint ?
In my expereince, paint is not durable enough for anything but rifles that get more tender treatment. I have always ended up with scarified finishes, and needed to strip them.
If camo is your goal, I'd suggest something that's easier, and easier to replace, which better reflects the real situation.
I use camo tape. Remington Vinyl RealTree Camo Tape is simple, effective, easily removable, and no sweat to replace. When it's removed, it all comes off, and the entie process is a lot easier on the underlying equipment.
Greg