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Trijicon ACOG 4 x 32 Scope USMC Rifle Combat Optic for A4 TA31RCO-A4CP
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: TA31RCO-A4CP-719307302068
Overview
Built for the M16A4 platform, this fixed 4x optic is aimed at shooters who need a compact sighting solution for both close and extended distances. Its dual-illumination reticle uses fiber optics and tritium to adjust to available light without batteries, while the USMC-style chevron reticle supports quick target acquisition and bullet drop compensation out to 800 meters. The “both eyes open” approach can help in close-quarters use, yet the magnification and ranging features keep it relevant when the shot distance stretches. It is a specialized optic with a clear mission, so it suits users who want a purpose-driven setup rather than a general-purpose scope.
Why Hunters Choose the Trijicon
Battery-free Illumination
Uses fiber optics and tritium
Usmc-specific Reticle
Supports quick close-range acquisition and
Bullet Drop
Compensator is designed for the
Both-eyes-open Use
Supports Bindon Aiming Concept shooting
Forged 7075-t6
Aluminum-alloy housing adds a rugged,
Key Features
- Designed for the M16A4 weapon system with a 20-inch barrel.
- 4x32 ACOG optic with the USMC Rifle Combat Optic configuration.
- Dual illumination uses fiber optics and self-luminous tritium.
- Battery-free illuminated reticle adjusts brightness automatically with available light.
- USMC red Chevron reticle supports bullet drop compensation out to 800 meters.
- Both-eyes-open use is supported through the Bindon Aiming Concept.
Best Used For
- M16A4 users needing a fixed 4x optic matched to a 20-inch barrel rifle setup
- Hunters wanting fast close-range aiming with magnified target identification at distance
- Shooters who prefer battery-free illumination that adjusts automatically to available light
- Users who value a both-eyes-open sight picture for close-quarters engagements
- Field users needing bullet drop compensation and ranging support out to 800 meters
Specifications
| Battery Free Illumination | Yes |
|---|---|
| Bindon Aiming Concept | Yes |
| Both Eyes Open Design | Yes |
| Bullet Drop Compensator | Yes |
| Combat Proven | Yes |
| Designed To Usmc Specifications | Yes |
| Enhanced Target Identification | Yes |
| Hit Probability | Yes |
| Housing Material | Forged 7075-T6 aircraft-aluminum-alloy |
| Illumination Technology | Dual illumination technology using a combination of fiber optics and self-luminous tritium |
| Magnification | 4x32 |
| Quick Target Acquisition | Yes |
| Reticle Pattern | USMC red Chevron ranging reticle |
| Target Range | out to 800 meters |
| Weapon System | M16A4 Weapon system (20 inch barrel) |
Pros
- Battery-free illumination uses fiber optics and tritium for automatic brightness adjustment.
- USMC-specific reticle supports quick close-range acquisition and ranging to 800 meters.
- Bullet Drop Compensator is designed for the M16A4 20-inch barrel system.
- Both-eyes-open use supports Bindon Aiming Concept shooting.
- Forged 7075-T6 aluminum-alloy housing adds a rugged, durable optic body.
Considerations & Trade-offs
- Designed for the M16A4 with a 20-inch barrel, so it is purpose-built rather than a general-purpose optic for every rifle setup.
- The tritium/fiber-optic illumination is battery-free, but brightness is tied to ambient light, so reticle visibility will vary with conditions.
- The 4x magnification and USMC ranging reticle support distance work, but they are less flexible than a variable-power optic for mixed-use hunting or close-range scanning.
- The optic is built around a specific bullet-drop compensating reticle and rifle system, so getting the most from it depends on matching it to the intended platform and load data.
Suggested Comparisons
- Magnified rifle scopes
- Prism scopes
- Fixed-power combat optics
- Illuminated reticle optics
Suggested Accessories
- Optic mount
- Lens cleaning kit
- Protective scope cover
- Rifle sling
Frequently Asked Questions
Is this ACOG model intended for the M16A4 / 20-inch barrel setup?
Yes. The product data says it is designed for the M16A4 weapon system with a 20-inch barrel and is built to the exact specifications of the United States Marine Corps.
How is the reticle illuminated?
It uses dual illumination with fiber optics and self-luminous tritium. The description also says the illuminated reticle automatically adjusts brightness based on available light, and it does not require a battery.
What does the USMC red Chevron reticle help with?
The product data says the USMC red Chevron ranging reticle provides quick target acquisition at close combat ranges and supports bullet drop compensation out to 800 meters.
Can this optic be used with both eyes open?
Yes. The description states that the ACOG can be used as a CQB sight when shooting both eyes open, using the Bindon Aiming Concept.
What is the housing made of?
The listed specification says it has a forged 7075-T6 aircraft-aluminum-alloy housing. No other material details are provided in the source data.