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The barrel is a metal tube through which the projectile travels.

Bore
The interior of the barrel. The bore may be smooth or rifled.
Breech
The rear end of the barrel, closed by a part called the breech plug. There are three types of breech plugs:
  • Flint
  • Bolster
  • Nipple
Muzzle
The open end of the barrel, where the projectile leaves the gun. In a muzzleloading firearm, the powder charge and projectile are loaded into the muzzle.