Pulling the trigger causes the __________ to strike and explode the primer in the base of the cartridge or shotshell.

The firing pin is an integral component of a firearm's operation. When the trigger is pulled, it triggers the action that moves the firing pin forward with force. This momentum allows the firing pin to strike the primer located at the base of the cartridge or shotshell. The primer is a small explosive charge that ignites the gunpowder within the cartridge, subsequently leading to the discharge of the round.

Each component in the firing mechanism plays a specific role, but the firing pin's function is crucial as it is directly responsible for initiating the ignition process. This aspect of firearm operation is fundamental to understanding how firearms function safely and effectively. Knowing this helps reinforce the importance of proper trigger discipline and handling practices for safe hunting and shooting experiences.