I've got a 7.5 inch Redhawk in .45 Colt. It has the factory square notch rear sight and ramp front sight with red insert. I can see the sight picture , but it is getting tougher and I barely see the red insert except in good sunlight. Aside from a red dot or scope, what are some recommendations. I have considered fiber optics, but am skeptical of their durability. Any thoughts?