I agree, the only advantage of these 'aids' is that they are parallex free and therefore will make up for inconsistant mounting and/or poor gun fit. My advice would be to practice mounting your gun and see if the sight picture (bead/rib etc) always looks the same, if not keep practicing until they do. Then fire a few shots at a patterning board and see where if the pattern is centred where you are aiming, if not then you need to do a bit of stock fitting.
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