The XS Big Dot Tritium improves target acquisition and low-light visibility in S&W J-Frames with pinned front sights, and Ruger SP101 with fixed rear sights. Installation requires a drill press to drill the retaining pin hole in the sight body.
Fast target acquisition in all light conditions
White dot reflects ambient light for low light visibility
Outsider diameter 0.188"
Fits common holsters
Installation requires a drill press