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Conventional eight groove rifling on the left, and octagonal polygonal rifling on the right. Polygonal rifling (/ p ə ˈ l ɪ ɡ ə n əl / pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile.
The gun used polygonal rifling, a principle invented by Whitworth in 1853.The concept was to use the hexagon to impart a very rapid spin to the projectile. The method of manufacturing the rifling was thus described by the Report of the Armstrong & Whitworth Committee of the British War Office (1866):
The HK P9 is a semi-automatic pistol from Heckler & Koch in 9×19mm Parabellum, .45 ACP, and 7.65×21mm Parabellum and the first to use a variation of H&K's roller delayed blowback system in a pistol format and polygonal rifling [1] now common in H&K designs.
3. Bond Arms. Taking great pride in their 'Made in Texas, by Texans' motto, Bond Arms has been producing robust, double-barrel derringer-style firearms for over a quarter-century.
Rifling of a 105 mm Royal Ordnance L7 tank gun Conventional rifling of a 90 mm M75 cannon (production year 1891, Austria-Hungary) Rifling in a GAU-8 autocannon. Rifling is the term for helical grooves machined into the internal surface of a firearms's barrel for imparting a spin to a projectile to improve its aerodynamic stability and accuracy.
Internal differences include a new buffer system and a change to polygonal rifling. All SR9s are marked "Made in W-Germany" on the right side of the receiver. SR9s imported after September 1994 were sold with a 5-round magazine because of the US Federal ban on magazines that could accept more than 10 rounds.
Kahr Arms is part of the Kahr Firearms Group, a US-based firearms manufacturer, which also includes Thompson Auto-Ordnance and Magnum Research. The Kahr Firearms Group company headquarters is in Greeley, Pennsylvania, with a manufacturing facility in Worcester, Massachusetts. [3] Kahr Arms was founded by Justin Moon, who is CEO and president.
Another feature of this pistol is the use of polygonal rifling in the barrel bore. This replaces the traditional lands and grooves rifling design with a rounded, smooth polygonal pattern which has a more "hills and valleys" appearance. The CZ 83 was set to discontinued/limited production status by CZ USA in 2012. [1]