I wouldn’t paint the barrel. With the heating/cooling and the shock of firing, I can’t see any paint sticking and it’ll just end up looking like heck. If you really want a different color, send it out and have it coated.
Plastic and synthetic stocks, I’ve painted with a low gloss spray paint and then used a sponge to dab other colors into the still damp base coat.
A common mistake I see is making the gun too dark with too many dark colors so it ends up looking like a big black gun from a distance. Especially bad if in a tree stand where you are backlit against a light sky or for snow camo. I use a light color as the “primary” and then put darker colors over the top for break up effect.
Grouse
Grouse