The Schmidt-Rubin K31 is a switzerland-made straight-pull rifle chambered in 7.5x55mm Swiss, introduced in 1933. Primary use: military, sport. Type: Rifle Action: Straight-Pull Caliber: 7.5x55mm Swiss Capacity: 5 Year introduced: 1933, Switzerland Weight: 128 oz Overall length: 43.5" Status: Discontinued Military use: Yes Intended use: military, sport