Ron, I would not modify the metal sights on a drilling. Modify the shot placement by reloading or changing brands. The drillings I have owned have shot slugs more accurately from the right barrel, but I will yield to other's experience. The sights will be regulated for iron sight shooting, but scope shooting it will not matter, because you will be making internal adjustments with the scope. If there is mechanical windage adjustment on the rear ring I will say this...put some removable locktite on it so that it will not inadvertently get adjusted without your knowledge.
