Hipfire grip is useless on a pulse rifle. It makes no sense why it has that perk in the first place when nobody hipfires with a pulse. Give it a different perk like encore or eye of the storm. Make the hipfire grip intrinsic to it just to replace the full auto perk on it since full auto fire is already part of the options in the game.
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Bring back the exotic mission for it and make it craftable. Or rejig the Shattered Throne and make it a craftable drop from that. Give us a reason to play it again.