Well I reached out to DD about the rail, and this was the response received:
Thank you for contacting Daniel Defense, Inc. Unfortunately, that product has been discontinued for over 5 years, we don’t even have the aluminum extrusions to make them if we wanted to. We will not be doing any additional units. If you have any questions, please do not hesitate to let us know. Have a great day!
V/R,
Frank Whitaker
Commercial Sales
So, I think the idea of them making more will never amount to anything more than a pipe dream. 😞