From AR15.com user ObsoleteMan:
It started with some inspiration from the video game “Army Of Two”.
The main characters use weapons equipped with shields.
I thought these gun-shields were an innovative, if not entirely practical, idea.
The functional components: A railed AR, Havoc 37mm Flare Launcher, Beta C-Mag
Extra components: Molded plastic grip with horizontal & vertical gripping points.
After having completed the above, I thought adding a stowable bipod would be a nice feature.
Before long, that idea changed to giving it vehicle-mounted capability.
Mounting via the rear hitch receiver, it has a vertically adjustable pedestal.
I went the quick route, not fabricating a true pintle/cradle or T&E.
The inner pedestal tube allows 360 degrees of horizontal traverse.
Elevation is from horizontal to vertical, but with no adjustable/locking elevating arc bracket.
Who likes picking up brass?
I added a 50cal ammo can/cradle to catch ejected shells and a 3” ABS plastic chute to direct them from the weapon into the ammo can.
Wearing a respirator, I heat-formed the ABS to better interface with the ejection port and clear the C-mag.
Painted and vehicle mounted:
The fact it is made out of mild steel means that it wont effectively stop very many calibers. The design could easily be transferred to a harder steel though.
Source AR15.com post – HERE