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Questions & Answers
How long does the tritium gas last? Manufacturer Answer

Tritium should glow for 10-12 years.

Monte @ XS

by XS Sights, Manufacturer, November 27, 2024
Will this sight fit a S&W 640-1 j frame with a pinned sight? Manufacturer Answer

Yes, but you will need to have our sight drilled for the cross pin.

Monte @ XS

by XS Sights, Manufacturer, November 27, 2024
Customer Reviews
Most Recent Reviews
Great sight by Chris, Verified Owner, June 10, 2025
This is a great addition to a revolver with gutter sights. A must addition.
Most Recent Reviews
XS Big Dot Sights by Doug, February 24, 2024
This sight is excellent for old eyes. The bright orange is easily visible and the night sight works great. I have these sights on several of my handguns and I am very please with this product.
Read All 2 Reviews
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Please note - Pistol sights require professional installation equipment. Improper installation can cause the product to misfunction or even damage the product, making it non-returnable. We strongly advise consulting a gunsmith before purchasing this product.

Product Info for XS Sight Systems Big Dot Tritium Sight Smith & Wesson/Ruger

The Second Generation XS Big Dot Orange Tritium night sight is a superior defensive sight. Precision machined in Fort Worth, TX, XS Sights feature a patent pending glow dot that absorbs light and glows in low light levels before it is dark enough to see the tritium. Optic Orange is designed to offer a high-contrast sight picture when shooting in bright light conditions and maintain its visibility in decreasing light levels. To ensure visibility in low light when uncharged, optic orange is primarily based on yellow with a hint of red. The increased surface area of the convex dot increases light absorption, intensifying the charge of the glow properties of the dot. Big Dot demands your attention - even in high stress and for those with poor eyesight, aids in rapidly achieving combat effective hits. Day-Light, Half-Light, or Low-Light, place the bottom of the dot in the bottom of the sight channel and center the dot over your target within 15 yards. Outside Diameter Big Dot 0.188"; fits in common holsters. Fits S&W J-Frame with pinned front sight and Ruger SP101 with a fixed rear. Installation requires a drill press to drill the retaining pin hole in sight body.image

WARNING: California`s Proposition 65

Specifications for XS Sight Systems Big Dot Tritium Sight Smith & Wesson/Ruger:

Manufacturer: XS Sight Systems
Gun Make: Smith & Wesson, Ruger
Gun Model: Smith & Wesson J-Frame Revolver, Ruger SP101
Color: Black
Gun Type: Pistol
Illumination Type: Tritium
Condition: New

Package Contents:

  • XS Sight Systems Big Dot Tritium Sight Smith & Wesson/Ruger

XS Sight Systems Big Dot Tritium Sight Smith & Wesson/Ruger Orderable Models

List of Orderable Models

  • XS Sight Systems Big Dot Sight Tritium, Green, S&W J Frame/Ruger SP101/Fixed Rear, RV-0003N-3Y , MPN: RV-0003N-3Y , UPC: 647533000604 , Code: XSS-AP-RVBG-RV-0003N-3Y
  • XS Sight Systems Big Dot Sight Tritium, Orange, S&W J Frame/Ruger SP101/Fixed Rear, RV-0003N-3N , MPN: RV-0003N-3N , UPC: 647533000598 , Code: XSS-AP-RVBG-RV-0003N-3N

XS Sight Systems Big Dot Tritium Sight Smith & Wesson/Ruger Unavailable & Discontinued Models

List of Unorderable Models

  • USED XS Sight Systems Big Dot Sight Tritium, Green, S&W J Frame/Ruger SP101/Fixed Rear, RV-0003N-3Y, EDEMO1, Used, Condition Fair , MPN: RV-0003N-3Y-EDEMO1 , Code: XSS-AP-RVBG-RV-0003N-3Y-EDEMO1
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