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I'm pretty sure the stocks they use are unpainted USGI stocks. The stocks themselves were produced in a few different shades of brown. That being said... I repainted a beat up GI stock awhile ago and used krylon "espresso". Turned out really nice.
I asked that question myself over at the M14FL and this is the paint they said is the closest to the original USGI color
The paint I believe referred allready was made by Krylon,it is one of thier Camo colors and is instock usually during hunting season.
It is a dead ringer for the USGI brown .