If you can't buff the quick and mid charge rate fusions at least let them shred in pve. The same goes for haake shotties, and fast fire rate snipers. If you guys are ok with that sort of inconsistency in PvP fine, just make the damn weapons relevant.
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I went into trials with my each new day fusion and it wrecked shotguns and snipers and some vigils too. Very viable if you have a decent roll.