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Only burner enemies, though all apply as long as their burners. Its so rare because of the 0.88% drop rate, which is bad enough alone, but this is only applied if the burner killed would drop a sniper rifle, then the engine rolls the rng and you have .88% to get a cobra as the rifle. Basically its stupid rare, because the drop rate has too tiers to it. 0.88% alone isnt accurate.
What is a man?! A miserable little pile of secrets!