In order to unlock the Kar98k in Warzone, all you have to do is reach player level 33. To unlock the Kar98k in Vanguard, you need to reach player level 43 instead - so an extra ten levels. If you're opting for Warzone alone, either battle royale or rebirth will be more than enough.

The Karabiner 98k, abbreviated as the Kar98k, is a German bolt-action rifle featured in every game of the Call of Duty series set during World War II, as well as appearing in the Rezurrection map pack or the Prestige or Hardened version of Call of Duty Black Ops in Zombies mode, and in Call of Duty: Modern Warfare and ...