Now that they're are no elemental primaries people can use whatever they want since no heavy/primary massively outclass all of the others besides maybe raze lighter and using raze lighter can easily get you killed.
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You forgot the Zhalo. It's arc. You can use it to complete arc weapon kill bounties and it arcs to nearby enemies. I love it, but it's still not my main weapon. I use whatever I want at the moment. I can only speak for myself, but the feel of a weapon, or look of the sights, and perks outweighs the elemental factor.
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No i didn't bother mentioning it because no not many people use it so its kind of irrelevant.
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I see it in PvP all the time. I whip it out if I know there'll be tons of low level adds. I have to disagree that it's irrelevant. It adds ammo for double kills, adds extra super energy, arcs to nearby enemy and is elemental. The mag size is good and the stability is better than the base state graphic indicates. It's a super badass weapon. Damn, now I want to play with it. Still have 30 min at work, tho.