Take a look at this
http://www.midwayusa.com/viewproduct/?productnumber=698217I assume it matches the barrel contour and since it is aluminum and lightweight
I think a significant amount of testing could be done by attachment with epoxy.
Heck it might even be ok for permanent attachment to barrel.
Has anyone ever tried this peep sight on the smooth barrel guns ?
It is borderline expensive at about forty bucks but no where near
the hundred bucks and much more of some peep sights.
I'm sorry I just dont believe the claims of 3 inch groups at 50 yards
without a rear sight. My group size was about 6 inches at 15 yards.
I also found some PEEP sight inserts for less than five bucks that I
might epoxy to the top of the receiver in front of the hammer as test.