"The German Kar 98 has the highest zoom of any of the available rifles. A lower muzzle velocity requires some compensation from the user at long distances, and the bolt action mechanism slows the rate of fire."
— in-game description
It is a DLC weapon that comes with the Assassinate The Führer DLC, along with the SVT-40.The starting ammunition for the Kar is 5/80, with the rifle's full ammunition being 5/100. The Kar is a bolt action rifle. It has highest zoom of any available rifles, with good bullet velocity(Sniper Elite 3), so player must compensate less for bullet drop. It's also not the fastest reloading rifle in the game.
The Kar98k was developed in 1924 and dubbed the "model 24". The basic Mauser action, however, had been developed in the late 1800's and served as the basis for all of the future variants. The US actually modeled the 1903 Springfield rifle off of a Mauser action.