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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Mine's at 5 right now, I think. But I need to bump it up to 6-7. I usually play at 7-8 on cod games. 360 used to have a feature where you could default to a higher sensitivity on all fps games. That was a cool feature.