Trijicon ACOG TA31-D-100367 4x 32 Dual Illuminated Green Horseshoe Dot .223 BAC Reticle…
- Rifle Scope
- 32 mm
- 4x
- Hunting, Target Shooting
- Better rated than 84%
A durable, battery-free 4x combat optic with a clear reticle, the eye relief takes some adjustment but owners who have run several ACOGs keep coming back to the line.
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How it ranks among the 359 rifle scopes we track
5.0★ across 21 Amazon ratings, Bayesian-smoothed toward the category average.
21 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 359 rifle scopes we track - how the scorecard works · full rifle scopes data report. Confidence: limited - limited rating history.Last refreshed Jun 22, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This is a Trijicon ACOG 4x32 rifle scope with a green horseshoe dot BAC reticle, calibrated for 5.56/.223 flattop rifles out to 800 meters. It comes in the Dark Earth finish with a forged aluminum housing.
The reticle uses dual illumination, fiber optics for daylight and tritium for low light, so it needs no battery to stay lit. Reviewers who have owned multiple ACOGs over the years consistently point to durability and reticle clarity as the reasons the line commands its price, though several also flag the tight eye relief as an adjustment for anyone new to the optic. It ships with a flattop adapter and lanyard assembly for the adjuster caps.
- 4x magnification, 32mm objective lens
- Green horseshoe dot BDC reticle, dual illuminated
- Bullet drop compensation to 800 meters
- Dark Earth finish, forged aluminum housing
Who it's for
AR-pattern rifle owners who want a rugged, battery-free combat optic and are prepared to adapt to a tighter eye relief than a typical variable scope. Less suited to shooters who prioritize a wide, forgiving eye box.
What buyers say
From Amazon customer reviews.
Owners, several of whom have bought multiple ACOGs over the years, describe the optic as rugged and the reticle as clear even at distance. The main recurring criticism is tight eye relief, which more than one reviewer flagged as something to expect going in rather than a defect. Buyers repeatedly framed the price as justified given the durability and lack of battery dependence.
Strengths and trade-offs
Drawn from this product's published specifications.
- No battery required, illuminates via fiber optics and tritium
- Reticle calibrated for 5.56/.223 out to 800 meters
- Forged aluminum housing described as rugged by repeat owners
- Can be paired with an RMR on a mounting plate for close-quarter use
- Eye relief is tight compared to many other rifle scopes
- High price point for the magnification level offered
Performance notes
Illumination comes from fiber optics in daylight and tritium at night, so the reticle stays lit without a battery or switch to manage. The BDC reticle is calibrated out to 800 meters for 5.56/.223 loads on flattop rifles. Multiple reviewers who have owned earlier ACOG generations described the reticle clarity and rugged housing as consistent across their units, with one noting they've bought this same model five times over 25 years.
Specifications
| Brand | Trijicon |
|---|---|
| Model | TA31-D-100367 |
| Dimensions & fit | |
| Objective Lens Diameter | 32 mm |
| Item Weight | 2 pounds |
| Construction & materials | |
| Material Type | Polymer |
| Color | Flat Dark Earth Finish |
| Compatibility & installation | |
| Mounting Type | Picatinny Mount |
| Compatible Devices | Rifle |
| Included components | |
| Unit Count | 1 ounce |
| Included Components | Scope, Mounting Hardware |
| Other details | |
| Magnification Minimum | 4x |
| Sport Type | Hunting, Target Shooting |
| Reticle Type | Horseshoe Dot |
| Thread Type | UNC |
| Night vision | No |
| Product Style | Green Horseshoe/Dot .223 Reticle |
| Field Of View | 36.8 Feet |
Other Trijicon rifle scopes
How it compares
This product against the closest alternatives we track in rifle scopes.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Trijicon ACOG TA31-D-100367 4x 32 Dual Illuminated Green Horseshoe Dot .223 BAC Reticle…This product | 5.0 / 5 | 21 | 2.7 / 5 |
| UTG 3-12X44 30mm Compact ScopeUTG | 4.5 / 5 | 3,000 | 4.4 / 5 |
| Vortex Optics Diamondback Second Focal PlaneBrand | 4.7 / 5 | 1,500 | 4.3 / 5 |
| PINTY Tactical Rifle Scope Combo: Illuminated OpticsPinty | 4.4 / 5 | 1,100 | 4.3 / 5 |
| Firefield RapidStrike 1-6x24 SFP Riflescope KitFirefield | 4.5 / 5 | 900 | 4.3 / 5 |
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Questions about the Trijicon TA31-D-100367
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the Trijicon ACOG TA31-D-100367 need batteries?
No, the reticle is illuminated by fiber optics during the day and tritium at night, so it works without a battery.
What caliber is the reticle calibrated for?
The BAC reticle is calibrated for 5.56/.223 flattop rifles, with bullet drop compensation out to 800 meters.
Can this ACOG be combined with a red dot for close range?
Yes, reviewers note it can take a mounting plate to piggyback an RMR-style red dot for close-quarters use.