Zombie's eye view.
Hey Max!! That thing looks like a Zombie!!
Where's the drum mag from?
The drum and adjustable gas regulator are from MD Arms.
Search Results - MD Arms
I also picked up one of these, but have not mounted it yet. It's a Romanian grenade launcher stock. It's got an internal spring loaded buffer.
My shoulder is toast from a MC accident years ago. It's OK for anything up to .308, but after an extended session of full load 12 gauge, it aches like hell.