It seems pointless
In: 10
Firing a gun is a multi step process. You have to load a round, close the bolt(sometimes), drop a firing pin to actually send a bullet down the barrel, and then finally eject the spent casing. All of this takes time. Having multiple barrels allow each barrel to be in a different part of the process, decreasing the delay between shots. This means that even when you are ejecting and chambering new rounds you can have another barrel firing. The barrels rotate so that they always fire from the same position keeping things accurate.
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