He probably has a fractured eye socket in the next photoLooks like an M2HB with an added stock extension and a scope. I certainly wouldn't want to fire it with that scope pressed against my eye like that.
Yeah, I was aware of that (which is why I said "generally") but I've rarely seen it done except for aircraft installations. The main thing that didn't look right for an M2 is the second tube under the barrel.The M2 can be adapted to feed from the left or the right, Zoom.