There are ammo dispensers in boss rooms...their called adds. Kill them and win a prize of ammo...equip a ammo finder to get more special ammo or heavy ammo...or equip a mod that allows you to generate ammo with finishers.
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You should know that doesn’t always work, especially this weeks nightfall. You could run ammo finder with a matching scavenger and sometimes heavy won’t drop the whole fight.
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Then what else can I say except RNGesus is a -blam!- at times. Besides as I stated earlier you still got ammo finishers and I doubt you got an empty super.