Trijicon TA31RCO-A4CP Rifle Scope Review
Our verdict
The Trijicon TA31RCO-A4CP is a battle-proven 3-4x ACOG with a 40mm objective, fiber optic and tritium illumination, and a Chevron Ranging reticle, all without batteries. At $1,339 and a 4.8-star average from 87 reviews, it has one of the strongest satisfaction records in this category.
Check price on AmazonBest for
Shooters who want a compact, always-on illuminated optic with a ranging reticle and zero battery dependency.
Skip if
You need more than 4x magnification for longer-range precision work, or you prefer a traditional duplex crosshair over a chevron reticle.
- Magnification 3-4X
- Objective lens 40 Mm
- Reticle Chevron Ranging
- Mount A4 W/ Ta51 Mount
- Material Fiber Optics & Tritium
- Color Red
- Priced 114% above the category median ($625.24 across 94 tracked models)
Our scorecard
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Owner rating4.8/5
4.8 average across 87 owner ratings
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Popularity2.8/5
87 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other optics: binoculars, telescopes, spotting scopes, rifle and hunting scopes, rangefinders, night vision and monoculars we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
The TA31RCO-A4CP operates on 3-4x magnification with a 40mm objective lens. The illumination system uses fiber optics for daylight and tritium for low-light conditions, so the reticle stays visible across a wide range of ambient light without any batteries or manual adjustments. The Chevron Ranging reticle allows users to estimate range based on target size, adding practical utility beyond basic crosshair designs. The scope comes in an A4 configuration with a TA51 mount included for flat-top Picatinny rails. At $1,339, the no-battery illumination and aluminum-and-tritium construction justify the premium for users who need a dependable optic across varying light conditions. The 87-review sample at 4.8 stars is the strongest satisfaction signal among the first eight products reviewed here.
Pros
- 4.8-star average from 87 reviews, strong buyer satisfaction signal
- Fiber optic and tritium illumination works without any batteries
- Chevron Ranging reticle adds distance estimation capability
- A4 mount with TA51 included for Picatinny rails
Cons
- 3-4x magnification range is narrow, limiting longer-range precision use
- $1,339 price is a significant investment
- No field of view figure listed in available data
- Chevron reticle has a learning curve compared to standard crosshairs
Specifications
| Magnification | 3-4X |
|---|---|
| Objective lens | 40 Mm |
| Reticle | Chevron Ranging |
| Mount | A4 W/ Ta51 Mount |
| Material | Fiber Optics & Tritium |
| Color | Red |
| Weight | 10.5 lb |
Performance notes
The 40mm objective lens gathers light efficiently at the 3-4x range. Fiber optics harvest ambient daylight for the reticle while tritium handles low-light automatically, creating a dual-source illumination system that adapts to conditions. The Chevron Ranging reticle is calibrated for specific cartridges, so buyers should confirm the reticle calibration matches their intended application.
What buyers say
87 reviews at 4.8 stars places this among the most consistently rated optics in the rifle scope category. That sample size is meaningful, and buyers appear to reward the no-battery illumination system and the overall durability of the ACOG platform.
More from Trijicon
Similar optics: binoculars, telescopes, spotting scopes, rifle and hunting scopes, rangefinders, night vision and monoculars to consider
Frequently asked questions
How does the Trijicon TA31RCO-A4CP illuminate the reticle without batteries?
The scope uses a dual illumination system. A fiber optic bundle on top collects ambient daylight to illuminate the reticle during the day. A tritium phosphor lamp takes over in low-light or dark conditions. The two sources work automatically based on available light, requiring no user input or battery changes.
What does the Chevron Ranging reticle do?
The chevron tip provides a precise aiming point, and the stadia lines are calibrated to estimate target range based on known target height. The calibration is cartridge-specific, meaning the ranging holds assume a particular bullet trajectory. Confirm the reticle version matches your intended use before purchasing.
Is the TA51 mount included with this scope?
The TA31RCO-A4CP is listed in an A4 configuration with the TA51 mount. The TA51 is designed for Picatinny and MIL-STD-1913 rails. Verify mount compatibility with your specific platform and confirm current package contents with the retailer before ordering.