I just visited a historical battleship museum and at the small arms locker they had a list of all the dozens of pistols, rifles, light machine guns, and so forth they had on board… and also three or four short-barreled shotguns that a contemporary crewman account affectionately referred to as “mutiny guns.”

Oh, hey! Same one Mechagodzilla uses!

For when you need to shoot four guys who are standing equally spaced