Nothing is cheap these days and cold blue is not likely to provide the black-blue of a hot dip black oxide finish. Oxpho-Blue is a good cold blue product and the creme version is very easy to apply. Make sure you remove all oils, grease, wax from the sight, then apply a little heat to the sight to drive moisture off of the metal before applying the cold blue. If you don't want to do that, then maybe some matte black enamel hobby paint.
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VCDL, GOA, NRA
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