Description
The Trijicon TA31RCO ACOG is a fixed-power 4x riflescope built to meet the requirements of the M4/M4A1 weapon system. It combines fiber-optic daylight adjustment and self-luminous tritium for an illuminated aiming point without batteries, and a chevron reticle pattern that supports quick target acquisition and reference-based bullet drop compensation. The optic is designed for rugged field use and includes mounting solutions for flattop rails plus an anti-reflection device.
Key Specifications
- The magnification is 4x for fixed, consistent target presentation.
- The objective lens measures 32 mm to balance compact size and light transmission.
- The reticle is an illuminated red chevron with a target reference system for holdover.
- Illumination is provided by fiber optics and tritium and requires no batteries.
- The optic is calibrated for .223 Rem / 5.56 NATO (14.5-inch barrel) ballistics.
- The eye relief is 1.5 inches for consistent sight picture at the recommended mounting position.
- The exit pupil is 8 mm for the 4x setting.
- The field of view at 100 yards is 36.8 ft for broad situational awareness.
- Adjustment characteristics include a 1/2 MOA click value and a stated 2 clicks per inch at 100 yards.
- The package includes a TA51 flattop thumbscrew mount and an anti-reflection device.
The TA31RCO provides a compact, battery-free illuminated aiming solution engineered for sustained field use and reference-based engagement. Its combination of fixed 4x magnification, rugged construction, and a chevron BDC-style reticle makes it suitable for practical application where reliable, low-maintenance optics are required.








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