Complete the required challenge or event tied to the Krig C in your game mode
Check the in-game Armory or Weapons menu for the exact unlock requirement
Finish any seasonal, battle pass, or limited-time objective if the Krig C is event-locked
If it is not yet available, wait for the weapon to be added to the current progression track or store bundle
If you already unlocked it, equip it from the Assault Rifles category in your loadout