Originally developed for the Israel Defense Force the Mepro M21 Red Dot Day/Night Self- Illuminated Reflex Sight represents the best of Meprolight tritium technology and remains in active duty for the IDF militaries and law enforcement agencies worldwide. A red dot sight with fiber-optic illumination by day Meprolight tritium by night it provides the advantage on any battlefield with no need for batteries ever. Its rugged battle-proven construction meets or exceeds rigorous MILSTD- 810 standards to thrive in the harshest conditions. Dual illuminated 1X Red-Dot reflex sight with a large 30mm diameter lens with Open X Reticle. Large field of view for rapid target acquisition. The MEPRO M21 is suitable for Night Vision Goggles or scopes including those with GEN III tubes and magnifying scopes such as the Mepro MX3F/T. Easy positioning of Magnifier close to the sights optics with no decrease in the field-of-view and without compromising convenient switch operation.