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AMMO BAG UPGRADE is a specialization featured in Battlefield 4 and is the first specialization apart of the Indirect Fire Upgrade Path. It increases the maximum number of Ammo boxes and Ammo Packs able to be deployed at once by one.
— In-Game Description
UPGRADED AMMO BOX is a Tier 2 specialization featured in Battlefield Hardline as a part of the Enforcer Reputation track. It enables players to carry an additional Ammo Box, allowing them to deploy it faster as a result.