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As far back as 1787 a Frenchman by the name of M. Magne de Marolles gave an account of choke-boring, though he argued against it. [3]Some sources state that the first pioneer was a Czech named Dominik Brandejs, who made shotguns with a choke in order to reduce the dispersion of shots, but his design was not popular in the 1820s.
Military use of combat shotguns through the 20th century has created a need for ammunition maximizing the combat effectiveness of such weapons within the limitations of international law. 12-gauge has been widely accepted as an appropriate bore diameter to provide an effective number of projectiles within an acceptable recoil. Early 12-gauge ...
A U.S. firearms manufacturer, Ameetec Arms LLC of Scottsdale, Arizona, started the manufacture of a USAS-12 semi-automatic clone in 2007, called the WM-12; it mainly differs from the USAS-12 by the lack of fixed sights and carrying handle, replaced by a Picatinny rail.
The final bore is the FABARM choke system which consists of standard choking followed by a cylinder profile at the muzzle which serves to improve shot patterns and distribution. [3] The muzzle is threaded to accept one of five different chokes or a muzzle brake/compensator. Some models were sold with a ventilated barrel shroud.
The UTAS UTS-15 is a 12 gauge pump-action shotgun with two 7-round magazine tubes that can feed in an alternating or selecting pattern. The UTS-15 has a 28.3" overall length with an 18.5" barrel, chambered for 2½", 2¾", and 3" magnum ammunition.
The metal strip immediately above the magazine tube is the ejector spring. The Winchester Model 1200 pump action shotgun employs a rotating bolt in a bolt carrier (slide) rather than the tilting breechblock used in the Model 12. [10] The Model 1200 was the second shotgun design to utilize a rotating bolt; the Armalite AR-17 being the first. [6]