Meprolight Tru-Dot sights are up to 20% brighter than other tritium sights. The front dot is slightly brighter than the rear sight to help the shooter focus on the target. Light tubes are sealed with a patented bonding process that makes them impervious to solvents and oils. Tru-Dot sights have a 10-year illumination warranty.
Smith and Wesson 3900, 4000, 5900, and 6900 Novak Notes:
Sights have their own Tritium gas light source - no batteries and no charging required
Sights are not affected by weather or gun solvents
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Meprolight Tru-Dot Sight Set S&W 3900, 4000 Novak Front and Rear Cuts Steel Blue Tritium Green