The Trijicon 4x32 ACOG rifle scope is a proven combat optic trusted by professional shooters and serious hunters who demand reliability without compromise. This matte-finish scope combines dual-illumination technology—fiber optics for daylight and self-luminous tritium for low-light situations—so your red horseshoe dot reticle stays visible whether you're hunting at dawn or engaging targets in dim conditions. No batteries required; the tritium runs indefinitely, and the fiber optic automatically adjusts brightness as ambient light changes, letting you keep both eyes open and maintain full situational awareness.
Built around the Bindon Aiming Concept, the horseshoe dot with target reference system excels at close-range target acquisition while the integrated Bullet Drop Compensator extends your effective range to 1000 meters. The 4x magnification and 32mm objective deliver a 36.8-foot field of view at 100 yards—wide enough for dynamic shooting, compact enough for modern rifles. External windage and elevation adjusters eliminate the need for tools and maintain waterproof integrity down to 11 meters without caps. This is a scope engineered to military specifications that works just as hard in the field as you do.
Your scope arrives complete with the TA51 thumbscrew mount for quick-detach installation, external adjuster caps, a protective scopecoat, lens cleaning pen, and adjuster lanyard. The forged aluminum housing and matte finish resist glare and blend seamlessly with tactical and hunting rifles alike. Whether you're running an AR platform, precision rifle, or service rifle, this ACOG delivers the no-nonsense glass and glass-free backup aiming point that soldiers and hunters have relied on for decades.
| Magnification | 4x |
| Objective Lens Diameter | 32mm |
| Length | 6.0 inches |
| Weight | 14.2 ounces |
| Field of View @ 100 yards | 36.8 feet |
| Field of View (degrees) | 7° |
| Eye Relief | 1.5 inches |
| Exit Pupil | 8mm |
| Adjustment @ 100 yards | 2 clicks/inch |
| Illumination | Fiber optics and tritium |
| Reticle | Red horseshoe with dot and target reference system |
| Calibration | 0.223 (14.5" or 20" barrel) |
| Housing Material | Forged aluminum |
| Finish | Matte |
| Mount | TA51 thumbscrew mount (included) |
The TA31RCO-M855 is calibrated for 0.223 ammunition on rifles with either a 14.5-inch or 20-inch barrel. It was originally designed for the M16A4 and M4 platforms, but works on any modern rifle chambered in that cartridge with compatible rail systems. The included TA51 thumbscrew mount facilitates quick detachment from picatinny rails.
No. The dual-illumination system uses fiber optics (which gather ambient light during the day) and self-luminous tritium (which illuminates in darkness). Tritium requires no batteries and provides constant illumination for years, while the fiber optic automatically adjusts reticle brightness as conditions change.
Your scope package includes the TA51 thumbscrew mount, two 1/10 miliradian external adjuster assemblies, two external adjuster caps, a lanyard assembly for the caps, a scopecoat (protective cover), a lens cleaning pen (LENSPEN), the RCO manual, and a warranty card.
Yes. The external windage and elevation adjusters require no tools—they turn by hand. Each adjustment provides 2 clicks per inch at 100 yards. The external design also maintains the scope's waterproof rating to 11 meters without the adjuster caps installed.
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Trijicon
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