EDIT -
APPARENTLY STATS CHANGE DURING THE WEEK
SORRY FOR SOUNDING LIKE A BLOOB
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I have a couple T5 Mint Retrogrades, but the one I use on the regular since Kackis recommended it is a T3 with Rewind Rounds + Elemental Honing. I use it with Getaway Artist to immediately proc EH x4 or 5 and it just chews through champions left and right. Definitely the best new weapon to drop in EoF.