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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.
A view of the break-action of a side-by-side, and an over-and-under double-barrelled shotgun, both shown with the action open. For most of the history of the shotgun, the breechloading break-action shotgun was the most common type, and double-barreled variants are by far the most commonly seen in modern days.
The next step was the fully rifled shotgun barrel by Hastings, a manufacturer of aftermarket shotgun barrels. Hasting's Paradox shotgun barrels were offered as aftermarket replacements for the most common brands of pump and semi-automatic shotguns and they quickly became popular with slug shooters.
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.
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 developments are troubling news for Ukraine as the war with neighboring Russia is in its 20th month and raises questions over whether Moscow may feel able to outlast western commitment promises.
Also available with pairs of handgun/rifled slug barrels in .357 Magnum/20-gauge and .44 Magnum/12-gauge. [21] Standard, Synthetic, Superlight, Ultra Varmint, Ultra Hunter, Buffalo Classic, CR Carbine, and Sportster models available. A version with a 16" threaded barrel chambered in .300 AAC Blackout is made for Advanced Armament Corporation. [22]