Yes, a bullet must be the same diameter as the barrel (unless it is a shotgun).
The gun barrel is the metal part that the bullet comes out of.
the barrel is the part that the bullet travels through once the gun is fired. it is on the inside of the gun.
"Caliber" refers to the size of the bullet the gun fires, or more specifically, the size of the bore, which is the size of the hole in the barrel.
A bullet leaves a gun barrel because it is forced out by the pressure of burning gasses.
It is the opening at the front of the gun where the bullet leaves the barrel.
Grooves cut into the inside of a gun barrel for the purpose of spinning the bullet when fired.
Barrel contains the force of expanding gasses, as it pushes bullet out of the barrel.
It is the hole at the front end of the barrel where the bullet leaves the gun.
the bullet and the barrel of the gun without a bullet it wont do anything by By Ray Lee Charles the top gun industries.
See the link below titled BULLET
The barrel of a firearm is the tube through which a bullet travels when a gun is fired.
Gun can refer to a long gun or a hand gun. A rifle is very particular. It has to have grooved barrel which spin the bullet when it is going down the barrel. This spin action on the bullet makes it more accurate.