I assume your Browning has the small (like 1/4") dovetail rear sight and the little 1/8" or less bump front sight. You have several options. Most any gunsmith or machinist or you can open the dovetail up to standard 3/8". Then you have many choices for rear sights. But it would have to be very low if you use the original front sight. You or a gunsmith/machinist could drill shallow holes in your current rear sight and use that glow paint that advertises on this web site. Or drill small thru holes and install fiber optic material in your rear sight. But none of these options will help much unless you change the front sight and thats a gunsmith (or very handy handyman) job. That means a higher front sight that could snag on a carry gun. Or just remember that a carry gun is made to be used at 10 yards or less where you basically don't even need sights.
Just walking on the edge of of my grave.