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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.
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.
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.
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.
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):
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]
Various calibers. available between .22-250 Rem. and .416 Rem., premium wood stock, matte metal finish, buttoning used on rifling for 22 or 24 in. stainless steel barrel, action made from 416 stainless or 4340 chrome moly steel (either left- or right-handed), 3 or 4 shot mag. supplied with 5 shot test target.
Glock pistols chambered for the .45 GAP (and the .45 ACP) feature octagonal polygonal rifling rather than the hexagonal-shaped bores used for models in most other chamberings. [125] Octagonal rifling provides a better gas seal in relatively large diameter rifled bores, since an octagon will have shorter sides and shallower angles than a hexagon ...