Trijicon ACOG 4x32 RCO Red Chevron Scope M16A4
Trijicon
$1,427.69
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Trijicon
Trijicon ACOG 4x32 RCO Red Chevron Scope M16A4
The Trijicon ACOG RCO 4x32 Red Chevron for the M16A4 is the exact optic issued to U.S. Marines — a battle-proven, fixed 4x riflescope engineered for precision at distance and lightning-fast target acquisition up close.
- Fixed 4x magnification optimized for the M16A4 and 5.56 NATO cartridge
- Red illuminated chevron reticle powered by fiber optics and tritium
- Bullet drop compensated (BDC) reticle calibrated for M855 ball ammunition
- Dual-illumination requires no batteries — works in any light condition
- Aircraft-grade aluminum housing withstands hard use and field conditions
- Both-eyes-open design enables rapid CQB target acquisition at 4x
Who This Is For
The Trijicon ACOG RCO 4x32 is purpose-built for AR-15 and M16A4 owners who want a military-specification optic used by U.S. Marines in combat. It's ideal for competitive shooters, serious home defenders, and collectors who demand a no-compromise, zero-battery-dependency riflescope that performs from room distance out to 600+ meters.
Specifications
| Model | TA31RCO-A4CP |
|---|---|
| Magnification | 4x |
| Objective Lens Diameter | 32mm |
| Reticle | Red Chevron (BDC, M855 5.56 NATO) |
| Illumination | Fiber Optic & Tritium (battery-free) |
| Eye Relief | 1.5 inches (38mm) |
| Field of View | 36.8 ft @ 100 yards |
| Length | 5.8 inches (147mm) |
| Weight | 9.9 oz (280g) with mount |
| Housing | Forged 7075-T6 Aircraft Aluminum |
| Mount | Integral A4 flat-top mount included |
| Made In | USA |
Frequently Asked Questions
Is the Trijicon ACOG RCO compatible with a standard AR-15 flat-top upper receiver?
Yes. The TA31RCO-A4CP comes with an integral mount designed specifically for MIL-STD-1913 Picatinny flat-top rails, making it a direct drop-on fit for any AR-15 or M16A4-pattern upper receiver with a standard flat-top. No additional rings or bases are required.
What ammunition is the BDC reticle calibrated for, and can I use it with other loads?
The red chevron BDC reticle is factory-calibrated for M855 62-grain 5.56 NATO ammunition fired from a 20-inch M16A4 barrel, with hash marks extending to 800 meters. Shooters using different barrel lengths or bullet weights can still use the reticle effectively, but should verify their actual point-of-impact at distance and apply hold-over corrections accordingly.
How long does the tritium illumination last, and what happens when it dims?
Trijicon's tritium lamp has a guaranteed brightness half-life of approximately 12 years, after which it will appear roughly half as bright as new. The fiber optic element simultaneously brightens the reticle in daylight conditions, so the optic remains fully functional in bright environments long after tritium brightness diminishes. Trijicon offers a tritium replacement service when a refresh is eventually needed.
