Zoom-in
All guns can be zoomed-in. With a zoomed-in weapon, you can easily hit your target and do a headshot especially if the target is far away from your current position. To do this, press the R3 while you are aiming then the gun will be zoomed-in. Try this with a Carbine Rifle and you'll see when it is zoomed-in, you can kill a pedestrian in one shot.
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