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The Meprolight M21 Self-Powered Day/Night Illuminated Reflex Sight (5.5MOA) offers a large 30mm diameter lens which allows rapid target acquisition with both eyes open. This was the first reflex sight in the world designed for close quarter combat, with 4.3MOA optional reticles. Illumination of the aiming point is achieved by a fiber optic collector system during the day and by a miniature self-powered tritium light source at night. Transition between the two systems is instantaneous and automatic to assure good contrast between the aiming dot and the target area. The MEPRO 21 reflex sight offers users the ability to acquire targets accurately at any range, in any situation, with both eyes open.