A gun barrel is a crucial component of a firearm, designed to direct the projectile when the gun is fired. It is typically a long, cylindrical tube made of metal, which helps to stabilize the bullet's flight and increase accuracy. The interior of the barrel often features grooves, known as rifling, which spin the bullet for improved trajectory. The length and diameter of the barrel can vary depending on the type of firearm, such as handguns, rifles, or shotguns. A longer barrel generally provides better accuracy and range, while a shorter barrel may offer increased maneuverability. Proper maintenance of the gun barrel is essential for safe and effective operation.