In that particular instance it would probably be easier if the real gunsight piper were being used instead of the Russian one (in error). The Russian one barely fits anyways but it's not the right setup.
Still the key point where the center point of the gunsight is set to infinity so that it's always on target no matter your perspective works. That's the key thing... using keys is hard but that whole system is really meant for a 6DoF implement like TrackIR or using some sort of hat setup on a joystick to simulate.
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