Because it has a very high rate of fire. Shotguns are destructive weapons at close range. U can easily take down pratereaons, knights, captains...etc with 1-2 shots. The 4th horseman can deliver 5 shots in the same rate of fire for 1 shot on any other shotgun. 5 shots in one go seems very exotic to me. U can almost knock out anything with those 5 shots.
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But then your reloading for a long ass time
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True. But still... it does pack a hell of a punch, but yeah the reload kills it.