How in Destiny are you able to get unlimited Ammo and how does it work, well lets find out by taking a look below on how does it work. See below how RyuugaDota explains how is done.
If you’re not in the know, there’s a mechanic in the game that gives you free ammo once you’re (almost#1) completely out of ammo. Most people think you get 50% or so of your max ammo, but that’s not correct based on my findings.
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First the game looks around and finds and collects ammo off of the ground for you. THEN the game checks to see if you received enough ammo for it’s purposes, and will give you free ammo if you didn’t. This “free,” ammo is up to (approximately#2) 2 primary ammo pickups, and 1 special ammo pickup. What this means is, the game will never give you “free,” rockets or LMG ammo. If you receive any, there was a purple ammo drop on the ground somewhere nearby.
For example, if you’re cave farming, you’re bound to have enough ammo to fill your ammo stores up. Using the free ammo mechanic will cause you to go to full ammo, since there will be so many pickups around. Note that the game will not overuse pickups on the ground. It will only take as much as is needed to fill your ammo reserves.
On the other hand, if you’ve taken refuge from the Devil Walker on Devil’s Lair and you’re out of ammo and there’s only 3 primary drops and no special drops on the ground, you’ll receive 3 primary ammo pickups, and then the game will give you a free special ammo pickup worth of ammo. If it happens again and there’s nothing on the ground, you get 2 primary and 1 special for free.
#1 If you’re out of Secondary, and Heavy ammo, and nearly out of primary ammo the mechanic can still activate.
#2 The amount given by ammo pickups varies, but 2 seems fairly accurate from my testing.