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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).
The "Foster slug", invented by Karl M. Foster in 1931, and patented in 1947 (U.S. patent 2,414,863), is a type of shotgun slug designed to be fired through a smoothbore shotgun barrel, even though it commonly labeled as a "rifled" slug. A rifled slug is for smooth bores and a sabot slug is for rifled barrels.
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 Ultra slug barrel is a "Heavy" barrel. It is about 1/8" thick all the way around and the added weight helps tremendously with recoil. There is also a bar in the stock that helps with recoil. It is extremely accurate with the aforementioned sabot slugs due to the extremely high velocity and aerodynamic stability of the slugs.
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.
The saboted slug had half the frontal area of the old slugs, which translated to less drag, and greater penetration. Lighter, faster slugs were also possible, allowing for a flatter trajectory and longer range. With the wide selection of barrels, shotshells and slugs, the modern shotgun is a tremendously versatile tool.
Most shotgun cartridges are designed to be fired from a smoothbore barrel, as "shot" would be spread too wide by rifling. A rifled barrel will increase the accuracy of sabot slugs, but makes it unsuitable for firing shot, as it imparts a spin to the shot cup, causing the shot cluster to disperse. A rifled slug uses rifling on the slug itself so ...
The second spring, located over the magazine tube, serves as the barrel recoil spring, allowing the barrel to recoil several inches into the receiver. The 11-48 differs from the Model 11 in the friction ring placed at the forward end of the barrel recoil spring. The Model 11 had a brass friction ring with one blunt end and one beveled end.