I haven't seen any threads about these gauntlets, but this is how I got mine:
After buying the P&T, I bought one engram from Xur as that was all I could afford. On the way to Rahool, I was saying, "Please, I just want the new gauntlets..." over and over. And Rahool gave me Khepri's Sting! This is the reason I still go to Rahool. Because Ives won't give me -blam!-.
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Where is xur ?