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A single-action revolver pistol is a multi-chambered handheld firearm that holds one cartridge or round in each of the cylinder's chambers. As the firing hammer is pulled back, a ratcheting mechanism rotates the cylinder to position a chamber between the hammer and the barrel. The hammer is held back by a latch in the trigger assembly. When the trigger is released, the hammer strikes the rear of the cartridge on its "primer," a tiny explosive charge. The primer ignites the powder in the cartridge and forces the projectile to travel down the barrel toward its target. As it travels down the barrel, spiral grooves cut into the barrel twist the projectile to give it a spinning motion as it leaves the barrel. This prevents the projectile from flipping end-over-end, giving it greater speed, distance and accuracy. The spent cartridge remains in the chamber. As the hammer is pulled back, the next chamber is rotated into place on the cylinder and the process is repeated. A "double-action" pistol works on the same principal, except the hammer can also be pulled back by using the trigger assembly. This allows for more rapid firing of multiple rounds.

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Q: How do the mechanics of revolver pistol work?
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