I just watched the SirD video on Sweet Business and I had an idea of how to improve the gun beyond the suggestion that he had to reduce muzzle flare impacting ADS sight (much like in D1 for the Necrocasm)
I think if you have a solid team and you focus support fire, Sweet Business is an alright exotic. That being said, something cool that Bungie could do to make the gun better is to add in another exotic aspect to the perk like this:
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Priming Business: Repeated attempts to reload the gun while magazine is full will cause the guardian to prime the gun barrels reducing the amount of 'wind-up' time on initial fire of the gun. Windup to full rate of fire takes 3 seconds and the gun will maintain maximum rate of fire for 1.5 seconds and proceed to reduce rate of fire over the next 1.5 seconds.
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The action would act just like reloading where you cannot sprint or you will stop priming the gun. If you do sprint or cancel the priming action the gun will remain at the current rate of fire for 1.5 seconds before diminishing for 1.5 seconds relative to the RoF that you had primed it up to. This wouldn't be a technically hard aspect to add into the game as they can barrow code from the sniper where you switch elements by reloading the gun at full magazine and the diminishing RoF is already built into the Sweet Business gun based on the wind up and how long you release the trigger.
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