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The Meprolight Mepro M21 Self-Powered Day/Night Bullseye Reticle Reflex Sight provides instant, all-light aiming capability, without batteries. Designed through close collaboration with Israeli Special Forces. It is battle proven, simple to use accurately and totally reliable. It features a large 30mm diameter lens which allows rapid target acquisition with both eyes open. Reticle illumination is achieved by a protected fiber optic light 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. It is night vision compatible. This reflex sight offers shooters the ability to acquire targets accurately at any range, in any situation, with both eyes open. It is also designed to work with a magnifier.