I have five C-More sights on various guns. Three are Railways and two are STS's. One of the STS's is on 617 revolver with an Alchin mount and I like it a lot. The Railways are on a 9mm carbine, a .22 target semi-auto and a 686 revolver. They all work great. I haven't decided what to put the other STS on yet. I like the brightness of the C-More dot and their reliability. And the batteries seem to last longer in these sights than in others.
- - - Buckspen