What happens when you pull the trigger on a firearm?

Pulling the trigger on a firearm is a critical action that initiates the firing sequence. When the trigger is pulled, it releases the firing pin or striker that strikes the primer of the cartridge, igniting the gunpowder inside the shell casing. This combustion produces gases that rapidly expand, forcing the bullet out of the barrel at high speed. Therefore, the correct answer emphasizes the end result of this action: the gun is fired.

Understanding this mechanism is crucial for safe handling and operation of firearms, as it highlights the importance of trigger discipline. Ensuring that you remain aware of where the muzzle is pointed and the state of the firearm when the trigger is pulled can prevent accidents and injuries.