Once a gutter . . . no more
I had a Colt New Agent with the gutter/trench sight. The only way I could shoot it reasonably well was by just indexing the gun. Trying to "sight" using the gutter just wouldn't work for me, at least beyond "spitting distance".
Apologies if I posted this before, but here is what Ned Christiansen did to fix it. Milled the slide top, leaving just a bit at the muzzle to place (via longitudinal dovetail and cross pins) the FO sight (Ned made it from scratch, with both the vertical and horizontal "light windows"). And he added his Shield Driver rear sight. (And some other stuff).
Nice gun now. Very nice!
https://i.imgur.com/zgviti6.jpg?1