The K31 is an interesting rifle, in that it’s a magazine-fed, straight-pull bolt action rifle that was the standard issue long arm of the Swiss armed forced from 1933 to 1958, though it remained in service until the 1970s. The integrated 6-round magazine is loaded from the top of the receiver. To operate the action, the bolt handle is pulled straight rearward to unlock the action and eject the spent casing in one motion. Pushing the bolt straight forward again chambers a new round, cocks the striker, and locks the action. The reduced range of motion was meant to increase the rifle’s rate of fire.