Then something is up with that person. Like I said anything past mid range does considerably less damage. I highly doubt you've been 2 shot across the map, when you can't even do it at close range hip firing.
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It's bugged, and you can do it up close hip firing. That's the whole point of the gun. They need to fix its range, and bring it and thorn down to the damage their archetype should be dealing.
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You can only do it hipfiring if it's 2 headshots. The range is terrible.