Trijicon ACOG TA31RCO-A4 4×32 | Red Chevron | 100226

The Trijicon ACOG TA31RCO-A4 is a fixed-power 4x riflescope specified for the USMC M16A4 (20″ barrel) platform. It combines fiber-optic and self-luminous tritium illumination to keep the red chevron aiming point visible in a wide range of lighting conditions without batteries. The optic includes a Bullet Drop Compensator (BDC) reticle pattern intended to aid holdovers at extended ranges.

Designed for hard service use, the TA31RCO-A4 is presented with both flattop and carry-handle mounting options and an Anti-Reflection Device (killFLASH) in some configurations. Typical applications include service-rifle use and range/tactical marksmanship training, where rapid target acquisition at close ranges and reliable engagement at extended ranges are both required.

Product Specifications

• The magnification is 4x.
• The objective lens diameter is 32 mm.
• The reticle is an illuminated red chevron with a target reference/Bullet Drop Compensator.
• The illumination sources are fiber optics and self-luminous tritium, requiring no batteries.
• The eye relief is 1.5 inches.
• The exit pupil is 8 mm.
• The field of view is 36.8 ft @ 100 yds (approximately 7 degrees).
• The calibration / BDC is set for .223 Rem / 5.56 NATO (20″ barrel A4 configuration).
• The optic features the Bindon Aiming Concept (BAC) to facilitate both-eyes-open aiming.
• The package includes a TA51 flattop thumbscrew mount and a carry-handle thumbscrew for A4 configuration, along with ARD, Scopecoat, LENSPEN, lanyard for adjuster caps, sticker, manual, and warranty card in typical kits.
• The housing material is forged aluminum finished in matte black.
• The optic is specified as waterproof, fogproof, and shockproof.
• The mount supplied is a TA51 flattop adapter for flat-top AR mounting and also includes a carry-handle thumbscrew for A4 use.
• The listed package UPC is 719307302068.

The TA31RCO-A4 is built for consistent, low-maintenance performance. Its battery-free illumination system and BDC reticle make it a practical choice for shooters who need a durable optic that performs across bright daylight and low-light conditions. Whether paired with a service rifle for training or used on the range for precision holdovers, the ACOG delivers a simple, rugged aiming solution with proven field pedigree.