they're shooting from a helicopter, adjustment in aim is done through flight controls, the guns are fixed to the pylons, it's probably not that easy and you can see the aircraft yaws every time it fires a rocket. would you come out from behind cover and shoot back? I wouldn't. The altitude is shown, but range is not, they could be firing 7.62 nato at 2000 yards from a machine gun for all we know...that would inherently be somewhat inaccurate under any circumstances...