Fiber optics are gonna be your best bet, The later Green Mountain LRH Barrels came with them (Williams I believe is who made/makes them) The Rear Sight fits the Octagon Barrel, the front is Simply Drifted in the Dovetail.

[Linked Image from i.imgur.com]

“Absolutely nothing is good enough if it can be made better. And better is never good enough if it can be made best." Author Unknown