Sharpie
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Sharpie
I use a black sharpie for the smaller spots.
Green, Brown and Tan cans of krylon. Go nuts. Done.
Black guns that are worn look beat. Camo'ed rattle can jobs that look worn are cool.
It's a good excuse to get a few cans of paint and cover the dings and scratches with some functional camo.
Paint it from the "book of pat."
Birchwood Casey's alumablack works, but be sure to clean/degrease the area before you apply.