Moving the front post 1 mm horizontally results in a 12 cm shift at 300 m. The sight line can be adjusted with a front sight adjustment tool. The rear sight is graduated from 100 up to 1500 meters in 100 meter increments. The standard sights on a K31 are open sights that can be adjusted for both windage and elevation. In some cases, collectors have used the information to contact the previous owners, and have recounted the details of those encounters on a variety of collector's web forums. This slip contains the name and address of the Swiss citizen to whom the rifle was issued. Many collectors of the K31 have removed the butt plate and recovered a small tag of plasticized paper from beneath it. The clip has a guide slot wide enough for a gloved thumb to force rounds down and into the magazine in one smooth motion. Whereas most charger clips only hold the end of the round, the K31 charger nearly covers the entire cartridge. K31s use a unique formed phenolic resin embedded paper charging clip with a tinned metal edge holding six rounds. Clamp-on sighting options for scopes and competition sights make it easier to mount a scope on the receiver. This means that a group of bullets shot at 100 yards will stay within a 1" diameter area, a group at 200 yards will stay within 2", etc. Many shooters are able to achieve one minute of arc with unmodified K31s. Therefore, the K31 was made with tight tolerances and excellent overall craftsmanship. The Swiss considered individual marksmanship to be of utmost importance. K31s are also noted for their excellent accuracy and quality. The K31 is noted for its straight-pull action, meaning that the bolt is pulled directly back, then pushed forward to cycle the action between shots, rather than being turned and pulled back and forth, as in the Mosin Nagant pattern rifles such as the M1891, or as in the more well known Mauser pattern rifles such as the K98k. The first 200 K31s were made in May 1931 for troop trials (serials 500,001 - 500,200), thus the model number of 1931. The K31 was a totally new design by Eidgenossische Waffenfabrik in Bern, Switzerland under Colonel Furrer, and the gun does not have the Schmidt-designed 1889 or 1896 action. A stripper clip loads the magazine from the top of the receiver.Īlthough the K31 is a straight-pull carbine like many other Swiss rifles, it was not designed by Rudolf Schmidt (1832–1898) as he was not alive to do so. Each rifle included a 6 round detachable box magazine with matching engraved serial number. It has a 6-round removable magazine, and is chambered for the 7.5x55mm Swiss (also known as Gewehrpatrone 1911, GP11, or unofficially 7.5x55mm Schmidt Rubin), a cartridge with ballistic qualities similar to the 7.62x51mm NATO/.308 Winchester cartridge. It was the standard issue rifle of the Swiss armed forces from 1933 until 1958, though examples remained in service into the 1970s. The Karabiner Model 1931 (K31) is a magazine-fed, straight-pull bolt-action rifle.
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