Shortening the barrel pirmarily makes the shotgun easier to conceal, such as under baggy clothing, or in a bag. This is also why you often see shortened shotguns with no stocks, either.
Shortening the barrel has the effect of reducing the shot velocity slightly, and widening the spread of the shot. These are further tradeoffs in favor of concealability and the ability to get close to your target before firing.
“Sawed off shotgun” sounds more intimidating and badass than they actually are. As others have pointed out, in terms of ballistic effectiveness a shorter barrel actually means less projectile velocity and thus less effectiveness on target, plus if you actually “sawed off” the barrel you can expect really crappy pellet groupings. The main, and in my 30 years of experience handling guns and having worked in the industry I’m willing to say the only real, advantages of a short barreled shotgun are concealabilty and maneuverability in close quarters. They’re a good weapon for an ambush or a hitman, they’re a poor weapon for anything resembling an actual gunfight.
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