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Concept
9×19mm Parabellum
Summary
The 9×19mm Parabellum (also known as the 9mm Parabellum or the 9mm Luger or simply as the 9mm) is a rimless, tapered firearms cartridge.
Originally designed by Austrian firearm designer Georg Luger in 1901, it is widely considered the most popular handgun and submachine gun cartridge due to its low cost and extensive availability.
Since the cartridge was designed for the Luger semi-automatic pistol, it has been given the designation of 9mm Luger by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) and the Commission internationale permanente pour l'épreuve des armes à feu portatives (CIP).
A 2007 US survey concluded that "about 60 percent of the firearms in use by police are 9mm [Parabellum]" and credited 9×19mm Parabellum pistol sales with making semiautomatic pistols more popular than revolvers.
The cartridge was developed by Austrian firearm designer Georg Luger in 1901. The cartridge was derived from an earlier round designed by Luger (7.65×21mm Parabellum), which itself was derived from a cartridge used in the Borchardt C-93 pistol (7.65×25mm Borchardt). Shortening the length of the cartridge case used in the Borchardt pistol allowed Luger to improve the design of the toggle lock and to incorporate a smaller, angled grip.
Luger's work on the Borchardt design evolved into the Luger pistol, which was first patented in 1898 and chambered in 7.65×21mm Parabellum. Demand from Germany for a larger caliber in their military sidearm led Luger to develop the 9×19mm Parabellum cartridge for the eventual P08 pistol. This was achieved by removing the bottleneck shape of the 7.65×21mm Parabellum case, resulting in a tapered rimless cartridge encasing a bullet that was 9 millimeters in diameter.
In 1902, Luger presented the new round to the British Small Arms Committee, as well as three prototype versions to the U.S. Army for testing at Springfield Arsenal in mid-1903. The Imperial German Navy adopted the cartridge in 1904, and in 1908, the German Army adopted it as well.
Official source
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