What is the function of the barrel in a firearm?

The barrel of a firearm plays a crucial role in guiding the projectile, or bullet, as it is expelled from the firearm. When a round is fired, the expanding gases created by the ignited gunpowder push the bullet down the barrel. The design of the barrel, including its length and rifling (the grooves inside the barrel), ensures that the bullet is stabilized and accurately directed toward the intended target.

The rifling imparts a spin on the bullet, which enhances its stability in flight and improves accuracy. A well-crafted barrel is essential for the performance of the firearm, as it directly affects the bullet's trajectory and overall efficacy in hitting the intended target. By ensuring that the projectile travels in a straight line and maintains its accuracy, the barrel's primary function is realized.