I remember when Magpul teased this prototype back in 2008. It looks like they are going to produce a production model slated for release 2022. Pricing should come in the latter half of this year.
https://youtu.be/TK_6x1Y533U
https://magpul.com/fdp-fdc
https://youtu.be/TK_6x1Y533U
https://magpul.com/fdp-fdc