Just playing Call of Duty and noticed the death machine spins and I always wondered why.
In: Engineering
When a gun fires a bullet, a lot of the explody gas heat energy transfers to the gun barrel; hot gun barrels can warp and deform which isn’t good. So a part of the reason you have multiple barrels is you can fire one barrel while 4 or 5 others are cooling down; by the time a barrel comes around to the active firing position again its cooled down enough. Also, a hot barrel might cause a round inserted in the breech to fire prematurely or explode or something. So cool barrels.
The other part is there is only so fast you can eject the spent shell casing and insert another shell casing into the breech of a gun. Attempting to do it faster with a single barrel+breech would cause the gun to jam. [Gatling guns are designed so a bullet is inserted and the casing ejected in numerous steps into each barrel as they rotate](https://www.youtube.com/watch?v=Yq6m7mpfc5A).
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