I think it would work better without the fibre optic. Just have a light source down the end of the tube, to see it you must be in line with it.
However, the big problem with this is, what if you're not exactly in line, and therefore can't see the light? There's nothing to tell you which way to move...
At least with iron sights you can tell if you're high, low, left or right.
The tube thing only tells you if you're on or off target.
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