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Usually it works when you are behind a half wall or box that you can crouch behind and see over when standing. When crouched down just aim down sights and you character should automatically stand up and look down sights. When you let off the aim trigger, your character should automatically crouch again. Not sure if this helps or not. You may know this and it simply just isn't activating. Don't know. I'm just bored and decided to type this essay.
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This seems so foreign to me hahaha!
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Go to any cover and aim directly at cover