Easily the Corrosive Shredifier I got as a world drop with Gaige (I think it was anyway!) just before I ran up Thousand Cuts through all the bots. Ammo was a bit of a problem of course but still amazing! 
I had a great Marcus train run if that counts.
It had :
A Storm.
Impaler.
Legendary Mech mod.
Plasma Caster.
And something else that I’ve forgot 
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Cobra from Biker at beatdown…
Stinkpot from No Beard…
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2 bekahs and a godfinger
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how’s the carnage
It’s great on Axton and amazing on Krieg.
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