My idea is simple - get rid of the tracking rounds, make it hitscan and ditch the 3-round burst in favour of full auto. For me this gun is so dire it needs a serious buff.
[spoiler]It could even herald a new special weapon type, the SMG, that bosses the area between shotgun and fusion range.[/spoiler]
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It needs the burst that is one of it's most important traits hit scan and no tracking fine but it needs something like giving it a secondary fire type like a mini shotty with less damage but like a 2 shot kill.