As much as I love the street howitzer, the quad load technique is a move that's used in 3 Gun competitions, and not a thing for the real world.
And no, "John Wick" is NOT the real world. :D
That being said, box-fed shotguns are getting better and better and more reliable. The first ones, the Saigas, were a bit of a joke, but the new Fostechs are quite good, and Mossberg now has mag-fed versions of the 590.