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When other sights are useless, the TRU-DOT sight shines without any switch to turn on or batteries to wear out. It has green tritium gas lights on both the front and rear blades, forming a green/green 3-dot sight picture. Some models are also available in green/yellow and green/orange. The front sight is always green for contrast with the rear sight. The sight is unaffected by any weather, gun solvents, or oils. It is used by NATO, U.S., and Israeli armies, and it is ideal for law enforcement and people who require accuracy during low-light conditions. The TRU-DOT sight contains both front and rear sights. Rear sights can replace the original rear, for example, 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). The factory warranty on TRU-DOT sights is for 12 years and applies only to the original purchaser.