Gun barrel
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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
Round shot
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A round shot is a solid spherical projectile without explosive charge, launched from a gun. Its diameter is slightly less than the bore of the barrel from which it is shot. A round shot fired from a large-caliber gun is also called a cannonball.
Various types of round shot made from stone, iron and lead found on board the 16th-century carrack Mary Rose
Mons Meg with its 20-inch caliber (51 cm), 386 lb (175 kg) cannonballs
Cannonball equipped with winglets for rifled cannons, c. 1860