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The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .
Semi-automatic and pump-action shotguns, whether held on shotgun or firearms certificates, are always required to comply with the specification of 24-inch minimum barrel length, 40-inch minimum overall length. [9] Muzzleloading firearms held on firearms certificates are exempt from any restrictions on barrel and overall length.
A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18 mm (0.71 in) to an extreme overbore of 20 mm (0.79 in). Some also claim an increased velocity with the overbored barrels, up to 15 m/s (49 ft/s), which is due to the larger swept volume of the overbored barrel.
Hatsan Escort Magnum, security and law enforcement purpose 12 gauge semi-automatic shotgun. The primary characteristic of a riot shotgun is a "short" barrel (generally 14 to 20 inches (360 to 510 mm) long; 18 in (460 mm) is the shortest length available to civilians in the U.S. that is not subject to additional federal ATF regulation) which makes the shotgun more compact and easier to handle ...
The Smith & Wesson Model 1000 is a semi-automatic shotgun offered in 12 and 20 gauge by Smith & Wesson during the 1970s and 1980s. The shotguns were developed and manufactured in Japan by Howa Machinery. [2]
The minimum barrel length for shotguns in most of the U.S. is 18 inches (460 mm), and this barrel length (sometimes 18.5–20 in (470–510 mm) to increase magazine capacity and/or ensure the gun is legal regardless of measuring differences [3]) is the primary choice for riot shotguns. The shorter barrel makes the weapon easier to maneuver ...
Barrel length: 500–660 mm (20–26 in) (average length, depends on ... The M3 is notable for allowing the user to choose between semi-automatic or pump-action ...
The Model 3000 was available in 12 and 20 gauge, chambering 2 + 3 ⁄ 4 or 3 in (7.0 or 7.6 cm) shotshells. [1] A "slug gun" variant chambered for 2 + 3 ⁄ 4-inch shells with a magazine extension and a shorter barrel was offered in 12 gauge only, with optional open sights.