So, alot of people asked for a ammo box. And This is what I've done. It is called 'The Random Box' It will give you a random amount of ammo for a random gun. The reload time is still being debated. But Im guessing around 20 or 30 seconds. The box will give a good amount of ammo though, so no worry.
20% Pistol or SMG ammo
60% Shotgun Ammo
5% Battery
25% Other
But of course, these are all mixed up. And there are some other possiblites, like crates full of ammo, and maybe npcs. A few easter eggs as well, if your lucky enough.
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A little more.
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