A keen eyed reader spotted the Remington Defense RAHG hadguard in a real life segment of a video promo for the upcoming Medal of Honor:War Fighter game.
Are far as I know, Remington has no plans to make this handguard available to consumers.
The full HoH:Warfighrer promo video is here (the handguard is can be seen at 1:09 and 1:43)…
[ Many thanks to Joseph for the tip. ]