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revolver>semi auto
-revolver has no chance of a jammed slide that a semi auto has. While one may argue a properly cleaned semi auto won't jam, there's always a chance, not so with a revolver
-revolver is quicker to load. While lacking clips, its easier and quicker to load a few bullets into the revolver than it is to load bullets into a clip.
-revolver looks better, which is a plus for someone buying a gun for recreational shooting (target range)
-revolvers have a smaller kick for the same round, due to the expanding gasses leaving the sides.
-revolvers are fucking awesome, no bones about it. They look good, they feel good in your hand, and they are functionally better.
the only real drawback with a revolver is bullets held in the gun at once, but its not really the issue it seems to be. A typical revolver holds six rounds, sometimes seven or five, depending on the gun, but it isn't as much of a drawback as you'd imagine. In a fight, if you can't kill whoever you're shooting at with six shots, its unlikely you'll kill them with more than six. On a range, it doesn't matter, as you can simply reload your gun.