Agree Tool Man. It's probably an aid to sighting similar in function to the V found at the breach end of a Parker vent rib. But again, if your eye height above the stock is not changed up or down, and the muzzle end of the rib or front sight is not moved up or down, then your POI will not change no matter what device you add to the rib. This assumes that the height of that device still allows you to see the front bead. If you can't see it and have to lift your head (eye), then the gun will shoot a higher POI.
BTW, you haven't aged a bit!
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