The Super Shorty is a pump action shotgun reduced to a 2-round tube capacity and a 6.5" barrel made by Serbu Firearms. The first one was made in 1998 and since then Mark Serbu has made more than 6,000 of them. There have been a bunch of minor variations, including batches made on both Remington 870 and Mossberg 500 actions, models in both 12ga and 20ga, and some with 3+1 or 4+1 capacities. It's a gun that Serbs himself finds a bit ridiculous, but it is also his company's best know product, and has not been used in a bunch of movies, TV shows, and video games.