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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It's "default" for a reason. It is the best balance for most players. Sniper focused may want to drop 1-2. I run 7 myself. Preference more than anything. I don't snipe much in PVP and being a hair faster on the look I think helps but those situations really don't come up often. Anyone saying 10 is a COD carryover.