Looks like it was "Photoshopped," LOL.
Just looks like a clumsy design.
Is the recoil of the shotgun being absorbed mainly by the front magazine well? LOL, can that rifle take that type of recoil pressure on that spot?
The .223 magazine as the handgrip? That's gotta mess around with that magazines long term reliability.
Horizontal only front handgrip (righthanded shooter only, to boot)? Not a very good tactical design esp for a weapon that's gotta weigh a lot.
Man, a very stupid design all around. I hope it's a "Photoshop" and not real.
LOL, and how much does it weigh with both magazines loaded and all?