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The Mepro 21 is a dual illuminated red dot reflex sight designed for quick, instinctive shooting with both eyes open. It provides instant aiming without batteries, using a fiber optic daylight source and a miniature self-powered tritium light source for night use. The aiming dot brightness automatically adjusts to ambient lighting conditions. Suitable for engagement at ranges up to 300 meters and compatible with night vision or scopes including GEN III tubes. No knobs or switches; no external power required.
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An analysis of AR-15 optic mounting heights, how height-over-bore affects zero offset and holdovers, and the tradeoffs between absolute co-witness, lower-third, and taller mounts.
6 min read
Guide
A high-level overview of the main optic categories, explaining tradeoffs between speed, versatility, and precision for AR-15 builds.
7 min read