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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there should be a meter to fill up over time, when meter is full alt fire mode can be accessed by holding a " button ". alt fire applies dot to the bullets fired for: 20 seconds or 80 bullets or something.