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TRIJICON TA31-C-100550 4x32 ACOG Scope Dual Illum Red Crosshair 223 Ret. The Trijicon TA31-C-100550 features a 4x32 ACOG scope with dual illumination using fiber optics and tritium for bright aiming points in any light condition. Includes a built-in Bullet Drop Calibrator for holdover to 600 meters. The scope sits on a TA51 mount with 1.5 in eye relief and 8 mm exit pupil. Mount: TA51. Mount comes with TA51. 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.
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