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When other sights fail, the TRU-DOT sight system truly shines. It requires no switch to activate and has no batteries to wear out. With each front and rear blade having its own green tritium gas light source, it offers a 3-dot sight picture that is green/green in color. Some models also come in green/yellow and green/orange. The front sight is always green for contrast with the rear sight. This sight system is impervious to weather, gun solvents, or oils, making it a favorite of NATO, US, and Israeli armies to guarantee precision in low-light circumstances. It is also ideal for law enforcement, and others needing accuracy in low-light scenarios. This sight package includes both front and rear sights, and rear sights either replace the original entirely or, on S&W revolvers, a new rear leaf, screw and nut are provided. Front sights either replace the original (1911 Auto), slip over and are pinned to the original blade (most other autos), or replace the factory colored insert (S&W Autos). A factory warranty on TRU-DOT sights is available to the original purchaser for a period of 12 years.