This is the "Goblin Deuce" ""Hide Away"" shotgun pistol. This creation is capable of firing 12 6mm BBs per shell or three paintball per shell (but who cares) and operates off of standard green gas or Co2.
A video regarding its review can be found here, between the times of 0:46 and 3:20.
A web sight giving more details can be found here.
I have a Solo and a Deuce coming in tomorrow for sale. If we still have one next weekend I plan on bringing one down to the game. And about the full size, I guarantee the manufacturer has heard that at least a few thousand times. If he plans to do something I am sure it is in the works. As for the spread, in our shooting lane 3'x50' as soon as you shoot you have a few hit the wall about 3 feet out but you do get a few that will hit the target at the end. So I could definitly see if being possible to get out a few people with one shot.