Which cartridge component is struck by the firing pin to ignite the primer?

• A. Primer
• B. Powder
• C. Bullet
• D. Case

Answer: (A)

The firing pin’s job is to strike the primer, a tiny explosive cap seated in the base of the cartridge. When the primer is struck, it detonates and produces a flash that lights the main propellant powder inside the case. The burning powder then rapidly generates high-pressure gas that drives the bullet out of the barrel. The powder, the bullet, and the case each have their own roles, but only the primer is designed to be ignited by the firing pin’s impact.