You can see the sear lug if you click the image lager. And also the remnants of AM rail milling in front and towards the back in the side.
They should have held their value, or more. I get asked for these kind of parts all the time. Some are retired, or no longer in production.
It may just be the reflection of the lighting. Its a Dallara Rail for sure, but I cant tell if its been polished in the front differently, or if its the