Choke (firearms)
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A choke is a tapered constriction of a firearm barrel at its muzzle end. Chokes are most commonly seen on shotguns, but are also used on some rifles, pistols, or even airguns. Notably, some .22 LR match rifles have a constricted bore diameter near the muzzle.
Left: Permanent choke. Center: Replaceable choke inserted into the muzzle. Right: Threaded barrel without choke insert. (For illustration only; a threaded barrel must never be fired without a properly inserted choke tube.)
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