![]() As the light becomes dimmer, the green color appears greener. Under the bright daylight, the green lens coating is hardly noticeable. The M21’s reticle has an amber color and its 30mm objective lens’ coating has a green color tint to it. When mounted on an AR15 flat-top, the M21 has lower 1/3 co-witness with iron sights. The –m suffix is for modular design and because of that, every component on the M21m is replaceable and upgradeable. The current production model is actually the Mepro M21m. The tritium illumination unit is replaceable by factory service for a reasonable cost. It typically lasts up to 14 years before the tritium became unusable. The tritium lamp has a 10-year guarantee by Mako. The M21 is also available with the 16 MOA triangle reticle, 4.3 MOA dot, 5.5 MOA dot and the bullseye (a dot inside of a circle). The version that I tried has the “X” reticle. I had a chance to try out a Meprolight M21 reflex sight during an Israeli style carbine course offered by Mako Defense, a sister company of the Mako Group. The Mako Group is the authorized distributor of Meprolight rifle sights in North America. It features the always-on dual-illumination by fiber optic collectors during the day and it uses tritium illumination for low light and nighttime. ![]() The main reflex sight used by the IDF for the last 20 plus years is the Meprolight M21. With combat experiences from five major wars and concurrent anti-terrorism operations since its founding in 1948, the Israeli Defense Forces or IDF is one of the first military to understood the advantage of reflex sight on small arms for every infantryman.
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