Meprolight Mepro M21 1x Red Dot - Bullseye - Originally developed for the Israel Defense Force (IDF), the Mepro M21 represents the best of Meprolight tritium technology and remains on active duty for the IDF and militaries and law enforcement worldwide. A red dot sight with fiber-optic illumination by day, Meprolight tritium by night, it takes charge of any field of battle with no need for batteries, ever. Its rugged, battle-proven construction meets or exceeds rigorous MIL-STD-810 standards to thrive in the harshest conditions, with five available reticles and a big 30-millimeter lens for maximum situational awareness. No Batteries - No Switches - Always Ready; Large Field of View; Battle Proven;