Moving a rear sight to the right moves the POI to the right, moving it left moves POI left. You move the rear sight in the direction you need your grouping to move (front sights move opposite). The rear sight also moves in the same direct for height, if you need your group to move up you adjust the rear sight so it's higher in it's base (or lower if the group needs to move down).
The rule is the rear always moves in the direction you need your group to move, the front sight always moves in the opposite direct you want the group to move.
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