Which components make up a round?

The correct answer identifies the essential components of a round, which is a unit of ammunition used in firearms. A round consists of four principal components: the cartridge case, primer, powder, and bullet.

The cartridge case holds all the other components together and contains the propellant and the projectile. The primer serves as the ignition source; it is a small metallic cap that, when struck by the firing pin, ignites the powder inside the cartridge. The powder, specifically known as the propellant, generates gas when ignited and creates the necessary pressure to propel the bullet down the barrel. Finally, the bullet is the projectile that is expelled from the firearm when the round is fired.

In summary, this choice accurately represents the makeup of a round in ammunition, emphasizing the critical role of each component in the firing process. Understanding these elements is fundamental in firearms training and safety protocols within law enforcement and military contexts.