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Overview The PRIMARY ARMS SLx MD-20 Micro Red Dot Sight Gen II is part of the SLx optics line noted for innovation, reliability, and value. It features AUTOLIVE motion activation, a true 50,000-hour battery life, daylight-bright output, and a compact, durable body. The sight weighs 3.8 oz with battery and uses one CR2032 battery (included). It is compatible with industry standard micro mounts and provides proper cowitness.
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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.
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A high-level overview of the main optic categories, explaining tradeoffs between speed, versatility, and precision for AR-15 builds.
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