Terminology

is the ability to hit exactly what one is aiming at, and precision is the ability to hit the same place over and over again in a repeatable fashion.

is the functional mechanism of a breech-loading weapon that handles (loads, locks, fires, extracts and ejects) the ammunition, or the method by which that mechanism works.

is the process of aligning a firearm with a target so that a bullet fired from the firearm will strike the target where desired.

the projectiles and propelling charges used in small arms, artillery, and other guns.

the inability to keep the firearm still while the sights are aligned and the trigger is pulled.

is a tube through which the bullet is propelled.