Aim down sight.
With Xbox 360/Xbox One it's Left Trigger.
With PS3/PS4 it's L2.
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Edited by Kami: 11/6/2014 12:21:51 AMIt's L1 for me, PS has an option in controller settings to swap the buttons, so a player can have it either L1 or L2 (trigger). But most recent FPS games use L1 as default.