A rifle
The barrel of a firearm is the tube through which a bullet travels when a gun is fired.
We would typically call this a rifle.
The end of the barrel where the projectile leaves the barrel on firing.
A barrel shroud is a ventilated covering for the barrel of a firearm which prevents accidental burns to the operators.
If that barrel is less than 16 inches long and you are in the US, you have an illegal firearm.
An octagon barrel on a firearm typically provides better accuracy due to its increased rigidity compared to a round barrel. Additionally, the octagon shape can give the firearm a more classic and traditional look, while a round barrel may offer a sleeker and more modern appearance.
Caliber is measured by the diameter of the interior of a firearm's barrel, typically expressed in inches or millimeters. For example, a .45 caliber firearm has a barrel diameter of 0.45 inches, while a 9mm caliber firearm has a barrel diameter of 9 millimeters. This measurement helps identify the size of the ammunition that can be used with the firearm.
Muzzle
A process of putting rifling in a barrel.
A hot barrel can affect the accuracy of a firearm by causing the metal to expand, which can change the dimensions of the barrel and affect the trajectory of the bullet. This can lead to decreased accuracy and consistency in shot placement.
The "crown" of any firearm is the front end of the barrel- the muzzle. It refers to a rounded shape of the end of the barrel.
As a bullet moves down the barrel of a firearm, it gets propelled by expanding gases from the ignited gunpowder. The rifling inside the barrel causes the bullet to spin, improving its accuracy by stabilizing its flight. The bullet gains speed and energy as it accelerates down the barrel before exiting the muzzle.