How tall is your front sight? Is the factory little dinky thing or is it of a larger size? If it is the original factory sight, I don't think there is much you can do. If the sight is around .187" tall, take the slide to a jewler or gun engraver and have him make a series of cuts in the sight and fill them with gold. The gold will pick up light evenly, will not tarnish and looks classy. Brass is the same color but it seems to pick up up light unevenly and it tarnishes. Silver does not seem to work very well either.
Ne Conjuge Nobiscum