Trijicon ACOG 4×32 Scopes

Trijicon ACOG 4×32 Scopes

The Trijicon ACOG 4×32 combines fixed magnification, a compact prism design, and an illuminated reticle in a forged-aluminum housing. Choose a classic, battery-free TA31, an AA-powered TA02 with selectable brightness, or a package with a separate RMR or RCR red dot. Reticle shape, illumination, and included hardware make each model distinct, so you can choose the ACOG that suits your preferences.

Choose Your ACOG Illumination

TA31: Fiber Optics and Tritium

The TA31 family uses fiber optics to collect ambient light and tritium for low-light illumination. The scope needs no battery and has no brightness dial. The TA31F with a red chevron and TA31F-G with a green chevron are straightforward examples, each supplied with a TA51 flattop mount.

Choose a TA31 if you value a simple, battery-free optic. Its illumination responds to available light, and the etched reticle remains visible even when the illuminated portion is less prominent.

TA02: LED Brightness You Control

The TA02 with a red crosshair uses one AA battery and six selectable brightness levels. An off position between each pair of adjacent settings lets you switch off the illumination without turning the dial all the way back to the lowest setting. It retains the fixed 4x view but replaces the fiber-optic and tritium system with an LED.

Trijicon rates battery life at more than 12,000 hours at brightness setting 4, using an alkaline battery at 70 degrees Fahrenheit. Runtime varies with temperature and brightness. Choose a TA02 when setting the illumination yourself matters more to you than having a battery-free scope.

TA01: A Traditional Crosshair with Tritium Illumination

TA01 configurations use tritium without a fiber-optic collector. The amber center-illuminated versions offer a dark crosshair in daylight and an illuminated center in low light. They are a distinct choice from both the dual-illuminated TA31 and battery-powered TA02, despite sharing the 4×32 format.

Chevron, Crosshair, Horseshoe, or Donut?

A chevron has an open, pointed center. A crosshair provides intersecting lines, while a horseshoe surrounds a separate dot. The TA31H red horseshoe-and-dot model offers that circular reference in red. Triangle and donut versions offer other classic ACOG sight pictures.

Choose the pattern and color that you find easiest to see, then check the exact model designation. A .223 reticle, a .300 Blackout pattern, and an RCO configuration are not interchangeable just because their housings look alike. Finish is another separate choice: an OD Green or FDE housing does not necessarily mean a green or amber reticle.

ACOG Packages with RMR or RCR Red Dots

An optic bundle combines the 4x ACOG with a separate, non-magnifying red dot above it. The red-chevron ACOG with RMR Type 2 and green-chevron ACOG with RMR Type 2 include a 3.25 MOA RM01 red dot with automatic brightness. Its CR2032 battery is independent of the battery-free ACOG illumination.

The ACOG with an enclosed RCR red dot adds a protected emitter chamber, manual brightness control for the red dot, and top-loading battery access. Its top-loading design lets you replace the RCR battery without removing the optic from its mount. Neither bundle turns the ACOG into a variable-power scope; you receive two separate optics.

For a package with additional hardware, the green-crosshair ACOG ECOS with RMR Type 2 includes backup iron sights and a quick-release mount. Check the specific ECOS model, as the amber TA01 and green TA31 versions use different scope illumination systems.

Mounts and Model Differences

Many 4×32 ACOGs include a TA51-style thumbscrew mount, while some ECOS packages include a quick-release mount. The TA31A triangle and TA31-G donut configurations instead come with carry-handle hardware. A flattop adapter is sold separately for those carry-handle models.

The TA31RCO-A4CP is the M16A4 version of the Rifle Combat Optic. Other RCO designations identify different reticle configurations. Across these choices, the ACOG uses a dedicated mounting base rather than conventional scope rings. It has 1.5 inches of eye relief, so check that your setup allows a comfortable viewing position.

Trijicon ACOG 4×32 FAQs

Does every 4×32 ACOG need a battery?

No. TA31 scopes use fiber optics and tritium, and TA01 scopes use tritium. TA02 LED scopes use an AA battery. A bundled RMR or RCR has its own battery even when the ACOG does not.

Can I change the magnification?

No. These ACOGs have fixed 4x magnification. A bundle with a red dot adds a separate non-magnifying optic rather than a zoom setting.

What is the difference between an ACOG with RMR and one with RCR?

The RMR Type 2 in these bundles is an open-emitter RM01 with automatic brightness. The RCR encloses its emitter, uses manual brightness controls, and has a top-loading battery. Both provide a 3.25 MOA red dot in the packages listed here.

Does every model include a TA51 mount?

No. Mounts and hardware vary by model. Many include a TA51-style mount, ECOS packages may include a quick-release mount, and carry-handle versions require a separate adapter for flattop use.

Are a green reticle and an OD Green finish the same thing?

No. Reticle color describes the illuminated reference inside the optic. Finish describes the exterior housing. Check both when choosing a model.

Is an ACOG a night-vision scope?

No. An illuminated reticle does not amplify light or provide a night-vision image. These are conventional magnified optics with illuminated reticle options.