The Ammo Pack is an alternative resupply item for the Support kit in Battlefield 4. It immediately provides two primary and/or secondary weapon magazines for the player that picks it up. It can supply up to three explosives or replacement gadgets, one at a time, like the regular Ammo Box but only while stopping on it.
Like the First Aid Pack, it can be thrown much further than the Ammo Box by targeting an ally. The pack will hone in on the player, making it unnecessary to compensate for their movement.
If thrown at a player that already has their full complement of reserve ammunition, the pack will remain on the ground.
Ammo Lockers are featured in Battlefield Hardline as a permanent fixture of some maps. They replenish the players supply of primary and secondary firearm ammunition, in addition to their gadgets and grenades, depending on which of these is equipped when interacting with the locker. To receive ammo, hold down the interaction button while looking at the locker--a "TAKE AMMO" prompt will appear on screen, the door on the locker will swing open, and the player will receive a full magazine of ammunition for each second the interaction button is held down, until the maximum carrying capacity is reached. Gadgets and Grenades take longer to resupply.