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The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity. [2]: 81 For example, the main guns of the Iowa-class battleships can be referred to as 16"/50 caliber. They are 16 inches in diameter and the barrel is 800 inches long (16 × 50 = 800).
The Model 686 Classic Hunter was introduced in 1988 and has a 150 mm (6 in) barrel and a non-fluted cylinder; the Model 686 Black Stainless was introduced in 1989 and has either a 100 or 150 mm (4 or 6 in) barrel with a black finish, with production limited to 5000; the Model 686 National Security Special was introduced in 1992 and has a 76 or ...
The first AC-130A Gunship IIs did away with the MXU-470/A mounts and instead used GAU-2/As, and not only had four 7.62mm GAU-2/A minigun mounts, but added four 20mm M61 Vulcan 6-barrel rotary cannons; this configuration was upgraded two years later in 1969 by removing two each of the GAU-2/As and M61s and adding two 40mm (1.58 in) L/60 Bofors ...
Fitz Special. John Henry Fitzgerald, an employee of Colt Firearms from 1918 to 1944, first came up with the Fitz Special snubnosed revolver concept around the mid-1920s, when he modified a .38 Special Colt Police Positive Special revolver, [5] by shortening the barrel to two inches (5.1 cm), shortening the ejector rod, bobbing the hammer spur, rounding the butt, and removing the front half of ...
The new military .38 Special loading propelled its 158 grains (10.2 g) bullet at a standard 850 ft/s (260 m/s) from a 4-inch (100 mm) revolver barrel. [16] During the war, many U.S. naval and Marine aircrew were also issued red-tipped 38 Special tracer ammunition using either a 120 or 158 gr (7.8 or 10.2 g) bullet for emergency signaling purposes.
Each brand of ammunition in each caliber/cartridge was tested at 18". Then, the barrel was removed and 1" was cut off the end of the barrel and the cut end was dressed. Once all the cartridges had been tested at 18" and the barrels were cut and ready, each brand was tested again at 17" and so on, right down to a 2" barrel.
Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
These guns were 50 calibers long, 50 times their 16-inch (406 mm) bore diameter with barrels 66.7 ft (20.3 m) long, from chamber to muzzle. Each gun weighed about 239,000 lb (108 t) without the breech, and 267,900 lb (121.5 t) with the breech. [1]