A smoothbore weapon is one that has a barrel without rifling. Smoothbores range from handheld firearms to powerful tank guns and large artillery mortars.
A smooth-bore, cast-iron ship's cannon, from the Grand Turk, a replica of a mid-18th century three-masted frigate
Replica of "Twin Sisters" smoothbores used in the Battle of San Jacinto (1836)
USS Monitor (1862) with the muzzle of one of its two 11-inch smoothbore Dahlgren guns showing
A gun barrel is a crucial part of gun-type weapons such as small firearms, artillery pieces, and air guns. It is the straight shooting tube, usually made of rigid high-strength metal, through which a contained rapid expansion of high-pressure gas(es) is used to propel a projectile out of the front end (muzzle) at a high velocity. The hollow interior of the barrel is called the bore, and the diameter of the bore is called its caliber, usually measured in inches or millimetres.
The Tsar Cannon of 1586 with its huge bore and a barrel exterior which is perceived like a stack of storage barrels
A female worker boring out the barrel of a Lee-Enfield rifle during WWI
The barrel of a 240 mm howitzer in use in 1944
A German Army G22 with fluted barrel
