260, I prefer X/S ghost ring receiver sights, but for the Rugers, there's not too many sights that just attach with a thumb nut like the NECG's. I have modified X/S Weavers to use on Rugers and both to use a thumb nut. To the OP, I apologize for getting off topic.

Ruger
[Linked Image from i.postimg.cc]

Weaver
[Linked Image from i.postimg.cc]