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The Krag–Petersson was the first repeating rifle adopted by the armed forces of Norway and was one of the first repeating rifles to be adopted as standard issue by a military force,〔(Wikborg, Trond, ''Krag–Petersson M1876'' ) Last retrieved 18 August 2005〕 being preceded by the Swiss Vetterli adopted in 1867. Developed by Ole Herman Johannes Krag, the action of the Krag–Petersson was uniquely actuated by an oversized hammer. Another distinguishing feature was that the cartridge rising from the magazine was not seated automatically, but had to be pushed into the breech of the rifle. Testing by the Norwegian military revealed the Krag–Petersson was a robust, accurate and quick-firing weapon, and the Royal Norwegian Navy adopted the rifle in 1876. The rifle was extensively tested by other nations, but none adopted it. After being phased out around 1900, the remaining rifles were sold to civilians and often were extensively rebuilt. Today, it is so difficult to find one in original condition that the Krag–Petersson has been described as "the rifle everybody has heard about, but hardly anybody has ever seen".〔 It was the first rifle designed by Ole H. J. Krag to be adopted by an armed force. ==Design and development== The mechanism was developed by Ole Herman Johannes Krag, with vital help from his friend Axel Petersson on the actuation of the mechanism.〔 Ole H. J. Krag had been experimenting with repeating rifles for several years before he designed the Krag–Petersson rifle. His earlier models were actuated by a side-mounted lever working an interior crankshaft.〔Hanevik, Karl Egil (1998). Norske Militærgeværer etter 1867〕 Moving the lever in a half circle, counter-clockwise, made the breechblock – the part of the mechanism that seals the rear of the barrel – move back and down. The rearward movement of the breechblock automatically ejected the spent round and the downward movement allowed the magazine follower to push a new round into the breech. In 1871, Axel Petersson suggested changing the design to allow the hammer to operate the breechblock instead,〔 thus making the mechanism both simpler and easier to operate. The Krag–Petersson, like Krag's previous design, featured a tubular magazine under the barrel.〔 The action of the Krag–Petersson is, as seen in the photograph to the right, simple compared to modern rifles. It consists of only eight major components: the receiver (A), the hammer (B), the tilting breechblock (C), the firing pin (D), two pins to secure the hammer and breechblock (E and F), a lockplate with a screw to secure the pins (G) and the tubular magazine (not shown in the photograph). The Krag–Petersson repeating rifle has a falling block action, ''i.e.'' the breechblock moves downwards as the mechanism is opened, actuated (operated) by the operation of the exterior hammer.〔 The tubular magazine, containing a total of 10 rounds of ammunition, was placed under the barrel. Once the mechanism was open, an extractor ejected the spent cartridge. A fresh round of ammunition was pushed into a shaped recess on top of the falling block by the spring in the magazine, whereupon the falling block rose slightly. The round could then be pushed into the chamber by the shooter, and the breechblock would rise completely. This rising of the breechblock (by means of a powerful spring) could catch the shooter off guard, resulting in pinched skin on the thumb.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Krag–Petersson」の詳細全文を読む スポンサード リンク
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