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

The Trijicon ACOG 4x32 ECOS rifle scope in FDE is a fixed-magnification optic purpose-built for shooters who need both close-quarters speed and distance precision in a single platform. This dual-sight system pairs a 4-power magnified scope with an integrated 3.25 MOA red dot RMR (Ruggedized Miniature Reflex) sight, giving you the flexibility to switch between quick-target acquisition and deliberate, magnified aiming without changing weapons or hunting positions. The 5.56 green crosshair reticle is optimized for AR platform shooters and offers clean, fast sight picture in varied lighting.

Built on combat-proven Trijicon engineering, the ACOG ECOS features tough aluminum alloy construction designed to withstand hard use in field conditions. The external windage and elevation adjusters require no tools and operate independently from the main scope body, maintaining waterproof integrity to 11 meters without protective caps. This is the kind of rugged, no-nonsense design that has earned the ACOG its reputation among serious shooters who can't afford failures.

The dual-sight concept shifts the shooting advantage in your favor: use the RMR for rapid engagements inside 50 yards, then dial in the 4x magnification for precision shots at distance. Both eyes-open operation with either reticle keeps your situational awareness intact, whether you're hunting, running drills at the range, or working through a defensive scenario. The ECOS comes mounted on a TA51 Flat Top mount, ready to attach to any Picatinny rail with standard spacing. Illuminated reticles perform across bright daylight and low/no-light conditions, adapting your optic to the reality of when hunting or shooting actually happens.

Key Features

• Fixed 4x32 magnification with integrated 3.25 MOA red dot RMR sight for close and distance shooting
• 5.56 green crosshair reticle, optimized for modern sporting rifles
• Rugged aluminum alloy housing; waterproof to 11 meters without caps
• Tool-free external windage and elevation adjusters
• Illuminated reticle for all-lighting-condition use
• Both eyes-open viewing design for situational awareness
• Includes TA51 Flat Top Picatinny mount
• FDE (Flat Dark Earth) finish

Specifications

Frequently Asked Questions

What rifle platforms does the ACOG 4x32 ECOS work with?

The TA51 Flat Top mount included with this scope is designed for Picatinny rail systems with standard spacing, which covers most modern AR-pattern rifles and other flat-top receivers. Confirm your rifle has a Picatinny rail before purchase.

Can I use the red dot RMR sight by itself without the magnified scope?

Yes. The dual-sight design lets you select either the 3.25 MOA red dot RMR for rapid target acquisition or the 4x magnified crosshair for precision shots. Both eyes-open operation with either reticle keeps you aware of your surroundings.

Is the reticle illumination battery-powered or tritium?

The ACOG ECOS features an illuminated reticle designed for bright to low/no light conditions. Refer to the user manual or Trijicon's technical documentation for details on power source and battery life.

What's included in the box?

The scope comes mounted on a TA51 Flat Top Picatinny mount, ready to attach to your rifle. Confirm any additional accessories (rings, caps, tools) by checking your specific package contents.