A pistol cartridge is a type of ammunition designed specifically for use in handguns. It consists of several components: a bullet (the projectile), gunpowder (the propellant), a casing (which holds everything together), and a primer (which ignites the gunpowder). Pistol cartridges come in various calibers, such as .45 ACP or 9mm, each suited for different types of handguns and purposes. When a pistol is fired, the trigger releases the firing pin, striking the primer. This ignites the gunpowder, creating gas that propels the bullet out of the barrel. Pistol cartridges are essential for shooting sports, self-defense, and law enforcement, making them a critical component of firearm operation.