I just bought a couple of uppers, that were slightly used.  One of them, a 20" govt profile, is slightly off color on the upper reciever.  Is there a relatively inexpensive way to get that black again?

If it was for me, it wouldnt be a problem.  A friend and I went in together and bought two used uppers, he is just waiting on his lower to arrive.  I put his upper on one of my lowers when it got here, and he expressed concern about the color difference.

Thanks in advance.

its in the anodizing not much you can do about it unless you refinish it

Quoted: its in the anodizing not much you can do about it unless you refinish it

+1