Breechloader
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A breechloader is a firearm in which the user loads the ammunition from the breech end of the barrel, as opposed to a muzzleloader, in which the user loads the ammunition from the (muzzle) end of the barrel.
Breech from Russian 122 mm M1910 howitzer, modified and combined with 105mm H37 howitzer barrel
Three-shot experimental breech-loading cannon (burst) belonging to Henry VIII of England, 1540–1543.
Early types of breech-loaders from the 15th and 16th century on display at the Army Museum in Stockholm.
Breech-loading firearm that belonged to Philip V of Spain, made by A. Tienza, Madrid circa 1715. It came with a ready-to-load reusable cartridge. This is a miquelet system.
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