Trijicon ACOG 4x32 ECOS Rifle Scope FDE, 5.56 Red Crosshair, 3.25 MOA Red Dot RMR

The Trijicon ACOG 4x32 ECOS rifle scope combines magnified precision with instant close-quarters capability in a single, rugged platform designed for shooters who need flexibility across multiple engagement distances. This dual-optic system pairs a 4-power magnified scope with an integrated 3.25 MOA RMR Type 2 red dot sight, giving you the choice between longer-range accuracy and rapid target acquisition without removing or replacing glass. Built for the 5.56 cartridge and calibrated accordingly, the ECOS excels in tactical, hunting, and precision rifle roles where versatility and speed matter equally.

The 4x32 magnification and 32mm objective deliver a bright sight picture with a 7-degree field of view and 36.8 feet of coverage at 100 yards—enough clarity for accurate shots while keeping both eyes aware of your surroundings. Dual fiber-optic and tritium illumination keeps the red crosshair visible in daylight and darkness without battery dependence; the mounted RMR offers its own LED backup for close-range work. External windage and elevation adjusters let you zero and dial without tools, and the clicks register at 2 minutes of adjustment per 100 yards. A 1.5-inch eye relief and 8mm exit pupil position naturally for most rifle stocks.

The forged aluminum housing is finished in Flat Dark Earth (FDE) and rated waterproof to 11 meters without caps—built to survive field use. This ECOS package ships with a quick-release mount, backup iron sights, a LENSPEN cleaning tool, and adjuster cap lanyard so nothing gets lost. Whether you're running close-quarters drills, hunting at varied distances, or training on multiple targets, the ACOG ECOS cuts the complexity and keeps your sight picture ready.

Key Features

• Dual-optic system: 4x magnified ACOG scope paired with integrated 3.25 MOA RMR Type 2 red dot for CQB and long-range use
• 5.56 calibration with bullet drop compensator for accurate ballistic holdover
• Fiber-optic and tritium illumination on the crosshair; LED backup on the RMR
• Tool-free external windage and elevation adjustments (2 MOA per click)
• Waterproof to 11 meters without lens caps
• Quick-release Trijicon mount for fast installation and removal
• Forged aluminum construction in FDE finish
• Includes backup iron sights, cleaning tool, and adjuster cap lanyard

Specifications

Frequently Asked Questions

What's included in the box with the ACOG ECOS?

The package includes the ACOG scope with integrated RMR Type 2 sight, a quick-release Trijicon mount, a set of backup iron sights, a LENSPEN lens cleaning tool, a lanyard assembly for the adjuster caps, the ACOG manual, and a warranty card.

Can I use the RMR and the magnified scope at the same time?

Yes—the RMR is mounted directly on the ACOG, so both sights are always aligned and ready. You choose which one to use depending on distance and threat: the RMR for close-quarters speed, the magnified scope for precision and longer-range shots.

What kind of illumination does this scope have?

The ACOG crosshair uses a combination of fiber optics and tritium; fiber gathers daylight for bright performance, and tritium provides passive glow for darkness. The integrated RMR Type 2 includes LED illumination with battery backup.

Is this scope calibrated for 5.56 NATO / .223?

Yes, the ECOS is calibrated for 0.223 (5.56 NATO) and includes a bullet drop compensator for ballistic holdover at distance.

Do I need any tools to adjust windage and elevation?

No—external windage and elevation adjusters allow you to zero and dial corrections without tools. Adjustments register at 2 MOA per click.