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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.
Walmart has backtracked on their decision to remove all guns and ammunition from sales floors and displays across the nation just one day after announcing the news. The retail giant only sells ...
The FX-05 is one of the world's few assault rifles featuring polygonal rifling, which eliminates the normal grooves of a weapons barrel replacing them with a system of "hills and valleys" in a rounded polygonal pattern. The optical sight is an integrated one with a carry handle attached as standard.
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.
Walmart Inc said it would discontinue sales of some ammunition in stores across the U.S., in response to the recent mass shootings in Texas.
Tyler Watson accuses by says he tried to buy a .22-caliber Ruger rifle on February 24 at Field & Stream, a chain of stores owned by Dick's Sporting Goods.