Which component of a bullet ignites the gunpowder?

The primer is the component of a bullet that ignites the gunpowder. It contains a small amount of sensitive explosive material that, when struck by the firing pin of a firearm, creates a spark. This spark is critical as it ignites the main charge of gunpowder within the casing.

Understanding the role of the primer is essential in firearms operation, as it serves as the initial catalyst for the firing sequence. When the trigger is pulled, the firing pin strikes the primer, generating the necessary heat and force to ignite the gunpowder. This combustion then rapidly expands, propelling the bullet out of the casing and down the barrel. The other components—the bullet itself, the casing, and the powder—are also important but serve different functions in the ammunition assembly. The bullet is what is fired, the casing holds all components together and contains the pressure from the ignited powder, while the powder is the propellant that generates the force needed to propel the bullet.