A pistol is a type of handgun that uses a single chamber and barrel. The pistol fires a chambered round, extracts and ejects the empty casing and then loads a new round into the chamber with each trigger pull.
A revolver is a handgun that contains a cylinder with multiple chambers. When the trigger is pulled, the cylinder rotates around a central pin to align the next chamber with the firing pin. A single barrel will fire one round per trigger pull.
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