A very good product - highly recommended!
The Williams Fire Sight for the SR22 is a very good investment if you really want to see your sights. They are good in low light but really become like neon in brighter lights. Really, really easy to pick up the sights quickly, even for mid 60s year old eyes.
They did require some filing to fit but nothing excessive. Just file a little and test fit then repeat until you are finished.
As mentioned by another reviewer, the sights are click adjustable for elevation, but must be drifted to adjust windage.
Reviewed by: Joe from Eastern New York.