The biggest issue with running something like a Monte Carlo isn't that they are terrible in PvE, its the fact you cannot run disrupter rounds, stagger rounds, and anti-barrier rounds. I can' t use the weapon in end game activities that have these champions. Please, at the very least give every exotic primary a ammo type of rounds or give us the ability to equip mods to them.
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The main issue is taking it into Crucible. Granted, Crucible shouldn't even be effected by the Ammo mods this season, should just be a PvE perk like Finisher Mods. But for PvE, I agree, it's a bit lame that I can't use primary Exotics for content because I need ammo mods.