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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I already has this idea of those mods being passive abilities because exotics can't be equppied with those mods.