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 used to play on a 5, but when I got my kontrol freeks I moved I up to a 7, I think it felt more natural that was. The first game I ever played with them I just dropped 32 kills, i wasn't trying that hard either. Just trying to get used to them xD