Instant all-light target acquisition, NO batteries needed! Designed through close collaboration with Israeli Special Forces, these Meprolight M21 Reflex Sights use a fiber optic light-gathering system during the day, and self-powered tritium at night to ensure a bright aiming point around the clock. No fumbling with batteries or switches. Just lightning-quick, both-eyes-open targeting!
Note: Does not include cleaning brush listed in item's instructional manual.