For me personally I would buff for PVE only. I didn't really like auto rifles before they were nerfed and now they are pretty much worthless.
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A little buff that's it. ARs aren't that good in RL anyway. Give me a hand cannon or a weapon like a Mida. SUROs should get a buff and be back near top because it's an exotic, so that's a different story (compared to legendary exotics) SURO's, Vex (before the 20 nerfs), Thorn, Red Death, Mida all deserve to be OP weapons in the crucible imo.