[spoiler]So I've been seeing people talking about how to get TImur's Lash, the (only?) legendary Iron Banner item drop you can get while playing Iron Banner. I myself got it after a 15 kill streak game, and finishing in first place, so I wondered if other people had also earned it the same way. Me and a friend started playing Iron Banner, and he picked up the weapon after a 10 kill streak. in 2 other games, we saw that 2 snipers (be it on our team or the enemies) ended up getting at least a 10 kill streak and finishing in first, they got the Timur's Lash drop. So I think that's how the weapon drops; it's not how many games you play or RNG, but rather how long a streak you can get.
TL;DR
Prove yourself in the Iron Banner; earn at least a 10 kill streak, get a cool Hand Cannon.[/spoiler]
EDIT: All RNG. Saladin why must you betray our hopes and dreams
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All RNG, I've gotten a 20 kill streak in the Iron Banner. Came in first too. Got rare engram.