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The gauge (in American English or more commonly referred to as bore in British English) of a firearm is a unit of measurement used to express the inner diameter (bore diameter) and other necessary parameters to define in general a smoothbore barrel (compare to caliber, which defines a barrel with rifling and its cartridge).
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).
The g-force experienced by an object is due to the vector sum of all gravitational and non-gravitational forces acting on an object's freedom to move. In practice, as noted, these are surface-contact forces between objects. Such forces cause stresses and strains on objects, since they must be transmitted from an object surface. Because of these ...
For example, AWG 12g is 2.1 mm, but SWG 12g is 2.6 mm. AWG 8g happens to be the same as SWG 10g. AWG 000g is 10.4 mm, but SWG 000g is 9.4 mm. In most discussions of body jewelry, sizes are specified by giving the gauge, usually abbreviated by the suffix "g", the same symbol as used for grams: "12g".
The increments between gauge sizes are not linear and vary. [2] At higher gauge numbers, the increment between the two highest gauges is 0.001 inches (0.025 mm), while at lower gauge numbers, the increment between the two lowest gauges is 0.046 inches (1.2 mm).
An overview of ranges of mass. To help compare different orders of magnitude, the following lists describe various mass levels between 10 −67 kg and 10 52 kg. The least massive thing listed here is a graviton, and the most massive thing is the observable universe.
All Remington 870 versions are built on the same platform and receiver, but there are small differences that can be more than just cosmetic. In 1969, Remington introduced 28 gauge and .410 bore models on a new scaled-down receiver size, and in 1972, a 20-gauge Lightweight ("LW") version was introduced on the same sized receiver, and all of the ...
The Winchester Model 1912, also commonly known as the Winchester 1912, Model 12, or M12, is an internal-hammer pump-action shotgun with an external tube magazine. Popularly named the Perfect Repeater at its introduction, it largely set the standard for pump-action shotguns over its 51-year high-rate production life.