The XS Sights Big Dot Tritium Front Sight, S&W J-Frame/Ruger SP101 Green (XS Sights part no. RV0003N3Y) fits S&W J-Frame and Ruger SP101 revolvers with a green tritium lamp built into XS’s larger Big Dot profile, designed to get your eye on target faster than a smaller Standard Dot sight under stress. Installation requires drilling a .205 inch mounting pin hole rather than dropping straight in, so plan for a gunsmith or a steady hand with a drill press.

Key Specifications

• Fits S&W J-Frame and Ruger SP101 revolvers as a replacement front sight.
• Green tritium lamp stays visible in low light or complete darkness.
• Big Dot sight profile is larger than XS’s Standard Dot line for faster sight acquisition under stress.
• Steel and tritium construction holds up to defensive-revolver recoil over time.
• .205 inch pin hole diameter — installation requires drilling a mounting pin hole rather than a drop-in fit.

Frequently Asked Questions

What revolvers does this sight fit? The S&W J-Frame and Ruger SP101.

Is this a drop-in sight? No, installation requires drilling a .205 inch pin hole; it isn’t a drop-in replacement.

How is Big Dot different from Standard Dot? The Big Dot profile is larger, designed for faster sight acquisition in a defensive situation.

Buy the XS Sights Big Dot Tritium Front Sight, S&W J-Frame/Ruger SP101 Green

Get a faster sight picture with the XS Sights Big Dot Tritium Front Sight. Order through XS Sights’ lineup in our gun sights selection, shipped fast from our Lubbock, Texas gun shop.