I like the black finish too. The upper and lower I ordered from NoDak Spud for my SBR is their version of Colt Gray. Doesn't look bad but if I ever have to recoat it for any reason I will have to do both receivers as it will be hard for anyone locally to match.

I did order an A2/A3 lower in black and I have an A2 upper in black. I prefer black actually because it's easier to live with IMHO.