Get your double barreled pump here!
The guys at South East Arms (SEA) have come up with at least two double barreled pump action shotguns.
They DO exist!
How about those magazine extensions…
Not a misprint. Looks like they took a pair of Remington 870s and sistered them together with two distinct actions (one left ejecting and one right ejecting), barrels, triggers, and magazines– and one stock and forearm pump. More here
Eat your heart out.