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PRIMARY ARMS Rotary Knob 25mm Microdot with a 2 MOA red dot reticle. SLx line optic designed for AR platforms. Battery life up to 50,000 hours on medium setting. Battery type CR2032 (included). Weight 6.5 oz. Length 3 inches. Finish Hardcoat Anodized; housing aluminum. Includes risers and spacers for mounting to multiple center heights (0.96 in, 1.41 in, 1.54 in, or 1.64 in) and compatible with standard micro mounts. Fully multi-coated anti-reflective lenses. Night vision compatible. Reticle: 2 MOA dot. Warranty: Lifetime.
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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