A pistol is a mechanical device that is designed to fire bullets. Engineers have devised 2 common firing mechanisms for pistols, the hammer fired and striker fired, which aim to achieve the same purpose of firing the gun.
Hammer fired pistols have an external hammer (usually) that falls onto the firing pin when the trigger is pulled. The firing pin strikes the primer on the back of the cartridge, firing the gun. The photos below are of the Beretta PX4.
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