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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 .
A choke is designed to alter or shape the distribution of the shot as it leaves the firearm. For shooting most game birds and clay pigeons, a desirable pattern is one that is as large as possible while being dense enough to ensure multiple hits on the target, at a particular range. The choke should be tailored to the range and size of the targets.
left-to-right: .410 bore, 28 gauge, 20 gauge, and 12 gauge shotgun shells. The six most common shotgun gauges, in descending order of size, are the 10 gauge, 12 gauge, 16 gauge, 20 gauge, 28 gauge, and .410 bore. [7] By far the most popular is the 12 gauge, [7] particularly in the United States. [8]
The choke tubes were knurled on the outside, but shotgun was also shipped with a wrench to assist with removing the choke tubes. [1] Specs: 3-Shot, Takedown, 20 gauge only (2 1/2 & 2 3/4-inch), 2 shell detachable magazine. Weight 6 1/4 lbs, barrel, 25" with three interchangeable choke tubes, Modified, Full & Improved Cylinder.
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. The M37 unit weight was between 5 + 3 ⁄ 4 and 6 lbs; the fluctuation was dependent on the chambered gauge.
12-gauge, 20-gauge, and .410 bore: Action: ... with the 12-gauge size expressed in its metric equivalent of 18.5 mm. ... Optional screw-in chokes are available. A ...
This model is available in 12 gauge or 20 gauge. Five types of chokes are available. Typically sold with improved modified and full, internal chokes. extended aftermarket chokes available.
In 1928, the first sub-gauge Model 520 was introduced when a 16 gauge option was offered. [14] It was followed in 1930 by a 20 gauge Model 520. [15] Stevens Model 520 (1938-1939) The Model 520 last appeared in a Stevens sales publication in 1928 and 1929 (Catalog #57) [5] but remained in full production until 1939. [16]
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