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Chokes may also be formed even after a barrel is manufactured by increasing the diameter of the bore inside a barrel, creating what is called a "jug choke", or by installing screw-in chokes within a barrel. However implemented, a choke typically consists of a conical section that smoothly tapers from the bore diameter down to the choke diameter ...
Barrels: Barrels have ultimately been offered in lengths from 18 inches (460 mm) to 30 inches (760 mm) in 2-inch (50 mm) increments. Barrels have been chambered for 12, 16, or 20-gauge with either a 2.75-inch (70 mm) or 3-inch (76 mm) chamber. They have been offered with fixed choke (IC, M, F, Skeet and CB) or with Winchoke attachments.
Therefore with a 12-gauge, it would take 12 balls of lead of the same size as the 12 gauge shotgun's inner bore diameter to weigh 1 pound (454 grams). [6] The term is related to the measurement of cannons , which were also measured by the weight of their iron round shot ; an eight-pounder would fire an 8 lb (3.6 kg) ball.
The barrel seal activator is meant to be removed when using 3 + 1 ⁄ 2-inch or 3-inch shells, and installed when using shorter shells. [1] Some Model 11-87s have interchangeable screw-in chokes; other barrels are available with fixed chokes. Barrels are not interchangeable between the Model 1100 and Model 11-87. [1]
The barrel is rifled for the .45 Colt but has a special choke and vent rib to make it function as a shotgun. Due to the rifled barrel, the assembled firearm is considered a rifle or pistol (depending on barrel length) and thus is not subject to the United States' National Firearms Act's 18-inch (460 mm) minimum barrel length.
The M37 came in two styles, Standard and Boy's Model (introduced 1958). Modified choke or cylinder bore was furnished at no extra charge on special order only. The M37 was chambered in the following gauges and shells respectively: 12, 16, 20, 28, and 410 using 2 + 3 ⁄ 4-inch, 2 + 7 ⁄ 8-inch, 3-inch shells.
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The Mossberg 500 is a series of pump-action shotguns manufactured by O.F. Mossberg & Sons. [1] The 500 series comprises widely varying models of hammerless repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, stock and forearm materials.