Yeah, I've got the same folding stock too, which I don't particularly like the colour of either. From none not too long ago, to heaps! You're right Aaron, options galore. Flat black, heaps of types of wrinkle/texture paint, paper dabbing, etc. I'm leaning towards flat black, but what I found, and it looks like Tim has found, even flat black can have a sheen to it. On my hasbro build, I scuffed it down with fine sandpaper. You probably couldn't do that with the textures.
Anyway, Tim - as requested, good luck with the final finish. Awaiting eagerly.