There are various types of “packs” spawned around the game world and which can be looted for items.
However, unlike owned (bought) items, the items obtained from these packs are not permanent. So if you die or jump to another region, you will lose them. For example, if you own (obtained via a tier or in-game cash shop) a machine gun, then while in Heatwave you obtain a sniper rifle from a Portable Weapon Pack, then jump to Frostbite, you will still have the machine gun, but lose the sniper rifle.
Using these spawned packs gives you a chance to obtain and check out items without having to purchase them. So if you obtain a sniper rifle, then like it, you can later decide to buy your own which you can then take anywhere in the game.
During world events, NPC infantry and androids also drop loot when killed.
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