I usually play crucible and use snipers in my special slot.
I use kontrol freeks, a long one on my aiming stick.
Also I play on a 24" monitor
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I play on 1-4, usually. I'm a die-hard sniper and get more than half of my kills with it, even with the ammo nerf. If I miss a shot, I'm dead; that's why i need the sensitivity low, so it's more difficult to miss. I'm not an aggressive player, really, and almost no one sneaks up on me, so I don't need to worry about quick movements.