Just noticed this while playing the weekly, I tried using Special Ammo Synthesis twice to no avail, I use them when i'm depleted, so at 0.
Using one didn't ive me any ammo but the ammopack disappears from your inventory and the cooldown timer is enabled...
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i also had this problem, special and/or heavy didnt do shit in crota or in weekly
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It won't work if you're down and waiting for a teammate to pick you up.