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Trijicon ACOG 4x32 ECOS Combo Flat Dark Earth Red Crosshair .223 BDC TA31-D-100553 UPC 719307311817
Product Description
The Trijicon ACOG 4x32 ECOS (Enhanced Combat Optical Sight) Dual-Optic System (Trijicon MPN: TA31-D-100553, legacy catalog 100553) in Flat Dark Earth (FDE) is the ultimate multi-distance aiming package designed for modern tactical carbines. Engineared to military specifications, the primary 4x32 ACOG features a forged 7075-T6 aluminum body finished in durable FDE, incorporating dual-illumination fiber optics and tritium technology. The illuminated Red Crosshair reticle is calibrated specifically for .223 Remington / 5.56x45mm NATO ballistics, offering integrated Bullet Drop Compensation (BDC) holdovers and target ranging stadia out to 1,000 meters without relying on batteries.
To provide instantaneous close-quarters threat engagement, the ECOS system comes factory-equipped with a top-mounted Trijicon RMR Type 2 LED 3.25 MOA Red Dot sight riding on a reinforced aluminum mount, alongside auxiliary iron sights integrated onto the optic housing. The assembly utilizes an integrated Quick-Detach (QD) lever mount from A.R.M.S., allowing rapid mounting, positive return-to-zero clamping, and rock-solid lockup across standard MIL-STD-1913 Picatinny rail platforms.
Nitrogen-filled to eliminate internal fogging and waterproof to extreme depths, the ACOG ECOS setup is built to withstand extreme mechanical shock, high recoil impulses, and harsh operational environments. The combination of 4x optical clarity for mid-to-long-range identification with 1x passive red dot targeting provides total situational dominance across all engagement envelopes.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct mounting compatibility with all standard MIL-STD-1913 Picatinny receiver rails via the integrated A.R.M.S. QD lever mount assembly.
- Inspect the upper receiver top rail slot to confirm it is clear of debris, oil buildup, or carbon fouling.
- Disengage the locking tabs on the A.R.M.S. throw levers and pivot them open to loosen the base clamp.
- Place the ACOG base onto the receiver rail and slide the optic assembly forward towards the muzzle to seat the cross-bolts firmly against the rail recoil slots.
- Throw the lever latches rearward into the locked position until the secondary safety catches snap into engagement.
- Verify battery installation in the top RMR (CR2032 lithium battery) and select preferred brightness level via side push-buttons.
- Zero the primary 4x32 ACOG at 100 meters using the .223 BDC central crosshair point, then adjust the 1x RMR top sight independently at 25/50 meters for close-quarters alignment.
Key Features
- Dual-Illumination Optics: Fiber optic light pipe dynamically adjusts daytime reticle brightness; self-luminous tritium powers low-light reticle illumination.
- Included Trijicon RMR Type 2 Red Dot: Factory top-mounted 3.25 MOA micro red dot provides rapid 1x close-range target acquisition.
- Calibrated .223 / 5.56 NATO Reticle: Red Crosshair reticle features BDC holdovers and ranging stadia lines out to 1,000 meters.
- Forged 7075-T6 Aluminum Housing: Military-grade durability, nitrogen-purged fogproof seals, and FDE protective surface finish.
- Integrated A.R.M.S. QD Mount: Dual quick-detach throw levers offer repeatable clamping force and precise return-to-zero performance.
- Backup Iron Sights Included: Emergency iron sight posts mounted directly to the main optic body for zero-fail fail-safe aiming.
Product Specifications
- Brand: Trijicon
- Model/Series: ACOG 4x32 ECOS Dual Optic System
- MPN / SKU: TA31-D-100553 (Catalog SKU: 100553)
- UPC: 719307311817
- Magnification: 4x (ACOG) / 1x (RMR)
- Objective Lens Diameter: 32mm
- Reticle Pattern: Red Crosshair with .223 BDC / 3.25 MOA Red Dot (RMR)
- Illumination Source: Fiber Optics & Tritium (ACOG) / CR2032 LED (RMR)
- Mount Type: Integrated A.R.M.S. QD Throw-Lever Mount (MIL-STD-1913 Picatinny)
- Housing Material: Forged 7075-T6 Aluminum
- Finish: Flat Dark Earth (FDE)
- Country of Origin: USA
