The Ammo Cache is a Utility system introduced in Call of Duty: Black Ops Cold War and further featured in Call of Duty: Vanguard and Call of Duty: Black Ops 6, first appearing in Die Maschine. They allow the player to refill the ammo of any weaponry that expends ammo, for the cost of Zombie Essence with the cost being dependent on if the weapon is a Wonder Weapon or how upgraded said weapon is.
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An Ammo Cache in Black Ops 6.