I just bought a bushmaster upper to put on my mega lower.
(Megas are the same color as RRA)
It looked fine until I mounted it. compared to the mega, it looked almost blueish-greenish-black, and doesn't look very good.
I had considered trading the upper receiver for a RRA, but the tools are prohibitively expensive.
So I decided I want to put some type of gun coat on it to make it darker. I didn't see any threads on this, so if somebody could point me in the right direction, that would be great!