On two of my CMMG lowers I have:
I have a Bushy upper on my A4 build, and the finish/color is VERY close. Not exact, but close enough for me.
I also have a Fulton Armory upper on my M4gery, and it's a perfect match. I don't know whose uppers Fulton builds on, though.
My third CMMG lower is getting a CMMG upper soon, I hope.