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Trijicon ACOG 4x32mm Red Crosshair Reticle – TA31CH


  • Battery Free Illumination
  • Rugged Aluminum-Alloy Housing
  • “Both Eyes Open” Design
  • Superior Quality Glass Lenses
  • Fixed Magnification
  • Combat Proven
  • Shock-Resistant
  • Waterproof
  • Limited Lifetime Warranty

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Trijicon ACOG 4x32mm

The 4×32 Trijicon ACOG TA31 CH Red Crosshair Riflescope provides a dual illuminated reticle using fiber optics and tritium for a bright aiming point in any light condition. The ranging reticle allows for bullet drop compensation out to 600 meters without any manual adjustments.

The Trijicon ACOG (Advanced Combat Optical Gunsight) TA31-CH Red Crosshair is a fixed power, compact riflescope with an illuminated reticle pattern for use in bright to low/no light. Also, the ACOG is designed to be extremely durable and reliable. Combining traditional, precise distance marksmanship with CQB speed, many variants include a bullet drop compensated (BDC) reticle. Every feature of its design was chosen for a single purpose: to provide increased hit potential in all lighting conditions.

Bindon Aiming Concept

Certainly, the human vision is based on a  two-eyed vision of an image, traditional riflescopes present a monocular view of the target. This monocular view significantly decreases vision capabilities and makes it difficult to acquire and track targets.

Traditionally, “both eyes open” aiming has been widely used with iron sights or reflex-style sights, but use with a magnified scope was often deemed implausible. The Bindon Aiming Concept (BAC) is a method of combining “both eyes open” aiming while using a magnified scope.

Shooting with “both eyes open” offers several advantages to the user: better situational awareness, a far superior sense of balance, a wider field-of-view, and far less eye strain. Therefore, these advantages aid the shooter in quick target acquisition and improved shooting performance.

Utilizing BAC

When a shooter tracks a moving target with their shooting eye, the image appears blurry as the riflescope moves due to the magnification. Undoubtedly, this blurriness forces the brain to automatically switch eye focus and take in target data from the non-shooting eye. Due to the use of the highly illuminated aiming point, the reticle remains visible in the shooting eye and your brain will superimpose the aiming point onto the non-magnified target.

When the weapon is moving onto the target, you will not notice any magnification, all that will be seen is the illuminated reticle. Once you slow the weapon onto the target, the target will “zoom” in, allowing you to identify and engage more accurately if necessary. Additionally, this aiming concept happens naturally, without conscious thought, for those with equal or close-to-equal vision in both eyes.

Finding Your Dominant Eye

In order to maximize the potential of “both eyes open” aiming, you must know which eye is dominant. To determine this, conduct the following test:

First, OPEN BOTH EYES, and hold you index finger out in front of you line of sight on a fixed object.

Next, CLOSE your non-shooting eye and note the position of finger on target.

Then OPEN BOTH eyes, keeping finger on target.

Finally, CLOSE opposite eye and note position of finger on target.

If your finger/aiming point does NOT move, that is your dominant eye. If your finger/aiming point moves off target at a great distance, your OTHER eye is dominant.

TA31-CH Red Crosshair

Magnification 4 x
Objective Size 32 mm
Bullet Drop Compensator Yes
Length 5.8 in
Weight 9.9 oz without mount
Illumination Source Fiber Optics & Tritium
Reticle Pattern Crosshair
Day Reticle Color Red
Night Reticle Color Red
Calibration .223
Bindon Aiming Concept Yes
Eye Relief 1.5 in
Exit Pupil 8 mm
FOV (Degrees) 7
FOV @ 100 yards 36.8 ft
Adjustment @ 100 yards (clicks/in) 2
Mount TA51
Mount Comes With TA51
Housing Material Forged Aluminum

TA31-CH Red Crosshair

Flattop Mount(TA51)
4×32 Scopecoat(TA64)
Lanyard Assembly for Adjuster Caps(TA71E)
Trijicon Logo Sticker(PR15)
ACOG Manual
Warranty Card


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