One version I've been working on with
@Formidilosus.
MVA(Montana Vintage Arms) rear peep, two screw version.
Fits perfectly between front and rear pic sections.
SRS rail:
you have to either mill the recess flat or fill it with Devcon or another bedding type compound.
the reason is the spring for the ladder sits under the base and requires a flat surface to function.
Drill and tap rail for sight.
Front sights:
Front sight height needs to be 1.25" minimum for this for 16"-18" barrel. I went with 1.375" so the rear peep is a little higher off the receiver. Using a RokStok, this lines up perfect for me.
I modified the highest front dovetail mount I could find and screw mounted it to the barrel. This dovetail works with the Williams Western Precision peep allowing the front sight to be removable so it's less of a snag.
The sight radius is so short, moving the rear peep for yardage is not practical because the increments are so small it's not quick or repeatable with any degree of accuracy.
literally moving the rear sight .010" with a micrometer stem is the difference between 100yds and 250yds on my rifle. If the ladder had incremental stops it would be different. The MVA is a simple friction slider/stop.
I've come to the conclusion leaving the rear peep stationary and using the double crosshair insert is a better solution. currently the top is zeroed @ 100yds, slight hold over for 200. my combo drops .5 mil @ 200.
the bottom crosshair I think will be approximately a 400 yd hold. I haven't verified yet but its high @ 300.
I think this combo would serve 99% of realistic situations as a backup sight or Utah legal.
I will say, the perfect setup would have some windage adjustment to achieve a mechanical zero. Mine currently shoots 5" left @ 200 which is only about .002" alignment in the sights.
I can fix that by adjusting the rear sight but will require some smithing of screw holes.
If only someone made a RSS Utah/backup sight SET.
Another front sight that works very well but is fixed is a KNS crosshair front sight in a high dovetail ramp.