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Caliber (or caliber for the British spelling) can be defined 2 ways. As a whole number (such as a 3 inch 50 caliber gun) it is a ship's gun that has a barrel 50 times as long as the bore diameter- or a 150 inch barrel. The more common use as a fraction (such as .357 or .45) is the diameter of the inside of the barrel in decimal parts of an inch. A .308 rifle has an inside the barrel measurement of about .308 inches. Commonly called a .308 caliber rifle.
Barrel Blocking Device
It was only there in 2008.
Look in the Standard Catalog of Firearms under Forhand and Wadsworth.
adjustable barrel locks
adjustable barrel locks
adjustable barrel locks
A wheel barrow is a one or two wheeled device used to carry small loads. A wheel barrel is just a misspelling of the first.
A silencer is a device that reduces sound signature, and are illegal. a muzzle is the end of the barrel.
A choke is a device placed on the end of a shotgun barrel that changes the pattern of the shot as it leaves the rifle.
A sketch drawn by Leonardo Da Vinci. It is used to exert a powerful traction force
It's commonly known as a 'silencer'. It's a device that muffles the sound of the gunshot as the bullet exits the barrel.