Trijicon ACOG 4×32 BAC Horseshoe | TA31D100367

The Trijicon ACOG 4×32 BAC (TA31D100367) is a fixed-power riflescope designed for AR-style flattop rifles and similar platforms. It pairs a 4x magnification with a 32mm objective and a green horseshoe/dot reticle that is dual-illuminated by fiber optics and tritium. The reticle is calibrated for .223/5.56, and the scope supports the Bindon Aiming Concept (BAC) for both-eyes-open aiming.

Product Specifications

• The magnification is 4x.
• The objective size is 32mm.
• The reticle pattern is a Horseshoe Dot.
• The day reticle color is Green.
• The night reticle color is Green.
• Bullet Drop Compensating (BDC) is Yes.
• The calibration is for .223 / 5.56.
• Bindon Aiming Concept (BAC) support is Yes.
• The illumination source is Fiber Optics & Tritium.
• The eye relief is 1.5 in. (38.1mm).
• The exit pupil is 0.32 in. (8.13mm).
• The field of view is 7 degrees.
• The field of view at 100 yards is 36.8 ft.
• The mount included is a Flattop Thumbscrew Mount (TA51).
• The UPC is 719307307780.

This ACOG is well suited for medium-range precision and rapid target acquisition on AR-style flattop rifles, and for range-focused marksmanship where a rugged, always-on reticle and BAC compatibility are valued. The dual illumination system provides automatic daytime brightness via fiber optics and low-light visibility via tritium without batteries.

Built to perform in demanding environments, the TA31D100367 delivers a fixed 4x optical platform with a horseshoe/dot aiming reference calibrated for .223/5.56. Its fiber optic and tritium illumination, combined with BAC design, make it practical for fast, natural aiming while maintaining clear, repeatable holds at known distances.

Users commonly praise this ACOG for its optical clarity and its rugged, reliable construction.