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The TRU-DOT sight system is highly effective when traditional sights are insufficient. It does not require a switch or batteries, instead relying on green tritium gas lights in both the front and rear sights to create a green/green 3-dot sight picture. Some models offer alternative colors such as green/yellow or green/orange. The front sight is always green to provide contrast with the rear sight. The TRU-DOT sight system is not affected by weather, solvents, or oils, and it is used by military forces such as NATO, the U.S. Army, and the Israeli Army. It is also popular among law enforcement and people who need accuracy in low-light conditions. The sight system comes with both front and rear sights. On some firearms, the rear sight replaces the original entirely, while on others, including S&W revolvers, a new rear leaf, screw, and nut are provided. The front sights can either replace the original ones on a 1911 Auto, slip over and are pinned to the original blade on most other autos or replace the factory colored inserts on S&W Autos. TRU-DOT sights come with a factory warranty of 12 years for the original purchaser.