What is the primary purpose of the bullet in a firearm?

The primary purpose of the bullet in a firearm is to serve as the projectile that travels down the barrel and strikes the target. When the firearm is discharged, the ignition of the gunpowder generates gas, which propels the bullet forward at high velocity. This design is fundamental to the operation of firearms, as the bullet's shape, weight, and material can significantly influence its accuracy, trajectory, and impact upon hitting a target.

The bullet is specifically engineered to optimize performance, providing consistent delivery of force at impact. In this context, while other components such as the casing, powder, and primer have their respective functions in the firing process, they do not fulfill the role of actually being the object that impacts and delivers kinetic energy to the intended target.