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Truly exceptional in low-light conditions, the TRU-DOT sight outshines other sights. It operates without a switch or batteries, as both the front and rear blades feature their own green tritium gas light source to provide a 3-dot, green/green sight picture. They are also available in green/yellow and green/orange. The front sight is always green while the rear sight contrasts. They are unaffected by the weather, gun solvents, and oils, which is why they are used by NATO, U.S, and Israeli armies. Law enforcement and those who require accuracy in low-light situations will find it invaluable. TRU-DOT sight includes both front and rear sights. The rear sights replace the original entirely, while S&W revolvers offer a new rear leaf, screw, and nut. Front sights can either replace the original on 1911 Auto, slip over, and are pinned to the original blade on most other autos, or replace the factory colored insert on S&W Autos. Factory warranty for TRU-DOT sights is 12 years for the original purchaser.