Awesome members always doing awesome deeds for one another on here, that's cool as shit that you got an offer to send it off and get it cut right on a lathe! Only on Sniper's Hide! I'd send it to scudzuki and be done with it! If the color doesn't take you can also use a black touchup paint pen, they make 'em for touching up AR's and other "black" finishes. I'd try that over a sharpie, they work well. Every AR owner or owner/gunsmith should have one.
Brothers here have come through for me in a big way when I really needed it, and I've had others also offer to custom one off or modify some parts. My custom spotter setup was impossible without deeds like these. And I pay it forward where and when I can too. It's part of what makes this site so awesome, actions and not just words.
What you can also do is rubber band, tape, lace or otherwise attach a piece of opaque black plastic cut to make a long "bonnet" if you will, that extends over and sort of out, is open at the bottom for the most part, and can be cut or assembled however suits you. People make these and 3D print similar ones and they sell for $100 but all you need is a razor blade/knife, drill would be nice, and a sheet of flexible black plastic. Or leather. Seen that used too. You can also pack black coffee straws in a sunshade or long flip cap to make an ARD out of a short sunshade; a 1" ARD is equivalent to 7" sunshade? Or you can always buy one if they make one that'll fit your caps, the Tenebraex caps are pretty nice too. That's another solution.
Good luck either way!
