What is the main mechanical difference between a revolver and a semi-automatic pistol?

The mechanical distinction between a revolver and a semi-automatic pistol primarily lies in the firing mechanism for the cartridge. In a revolver, the firing mechanism is based on a rotating cylinder that houses multiple chambers, each capable of holding a single cartridge. When the trigger is pulled, the cylinder rotates to align a chamber with the barrel, allowing the hammer to strike the primer of the cartridge, firing it. This process can be either single action or double action, depending on the specific design of the revolver.

In contrast, a semi-automatic pistol utilizes the energy from the fired cartridge to cycle the action. Upon firing, the spent casing is ejected, and the slide moves back, compressing the recoil spring. This action then allows the next round from the magazine to be loaded into the chamber, enabling the pistol to fire again with just a pull of the trigger without manual intervention.

Understanding this difference is crucial for operators as it affects how each type of firearm operates, how they are loaded and fired, and ultimately how they are managed during use and maintenance.