Firstly, I apologize. I should have been more explanatory. I assumed the people here would recognize the item in the photos provided. I provided a # of pics because we all love seeing the details.
KB, you are correct. It is Kip's black variant. Yes, it isn't very black to say but I suppose it's Kip's final effort to provide us with a coating that would stand the test of time and be as "black" as he could get it on top of the titanium. Versus just painting it or otherwise coating it with something to achieve a total black that would eventually wear off. It's much "blacker" than the muted one I assure you. Many of us here know Kip's reputation is of the highest caliber and furthermore he is the only one who makes the perfectly sized 1/2 in bolt handle.
The polished and muted variants have been out for a long time. And I've been here long enough to know that as long as they have been around, people, myself included, have wanted one in black. That said, I've been in line with Kip for a black version for a long time. Soon enough others will have the opportunity as well since they have come to reality now.
Amsdorf, the rails are an all in one hanguard made by Surefire. Not hard to install at all. My optic is a Leupold Deltapoint reflex sight. It's small and awesome. Perfect for a shotgun. Best option IMO. There's other threads here where we have talked about it and other optic options.