From LPA
http://www.lpasights.com/catalog.html
http://www.rimfirecentral.com/forums/sh ... p?t=406547
I'm not sure how difficult it is as a DIY. I've replaced fixed sights with LPA adjustable sights on my S&W422 and replaced the Bomar with LPA one of my 1911's. They seem to work well and took very little time to install.
Adjustable Rear Sight for the Ruger Standard
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