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TRIJICON TA31-D-100553 TA31-D-100553 4x32 ACOG ECOS Dual Illum Red Crosshair reticle for 5.56 NATO rifles, Flat Dark Earth finish. Features dual illumination (fiber optics and tritium), external windage/elevation adjustments, and a forged aluminum housing. Mount: Quick Release. Weight: 15 oz. Length: 6.2 in. Magnification: 4x. Objective Size: 32 mm. Reticle: Red Crosshair. Caliber compatibility: 0.223 (per ECOS data). Mount Comes With: Quick Release. Housing Material: Forged Aluminum.
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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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