Trijicon ACOG 4×32 BAC ECOS Riflescope 5.56 BDC Green Crosshair Reticle
Features
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Dual‑Illuminated, Battery‑Free ACOG: Fiber optics automatically regulate reticle brightness in daylight; tritium lamp provides a glow in low/no light—no batteries required in the ACOG body.
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ECOS Dual‑Sighting System: Factory‑mated Trijicon RMR® Type 2 LED Red Dot (3.25 MOA) mounted atop the ACOG for instant, heads‑up CQB transitions without changing cheek weld.
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5.56 BDC Green Crosshair Reticle: Highly visible green crosshair with ballistic drop stadia scaled for 5.56 NATO / .223 trajectories (100 m zero) for rapid holds to extended distance.
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Backup Iron Sights & Quick‑Release Mount: Integrated mini iron sights on the included Trijicon QD Picatinny mount provide a tertiary aiming option; fast on/off with repeatable zero.
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Bindon Aiming Concept™ Speed: True both‑eyes‑open shooting at 4× magnification—maintain situational awareness while driving the crosshair on target.
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Battle‑Proven Durability: Forged aluminum housing, Cerakote® Flat Dark Earth finish, shock‑resistant, waterproof, fog‑proof—built for combat environments.
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External Tool‑Less Adjusters: 1/2 MOA windage & elevation clicks; no turret caps needed.
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Compact, Lightweight Deployment Kit: Designed for carbines where height, balance, and weight matter.
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Made in USA & Backed by Trijicon Warranty.
Technical Specifications for Trijicon ACOG 4×32 BAC ECOS Riflescope 5.56 BDC Green Crosshair Reticle
Specification
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Details
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Manufacturer
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Trijicon
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Model / MPN
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TA31‑D‑100554 / 100554
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SKU
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TA31‑D‑100554
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UPC
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719307311824
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Country of Origin
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USA
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Magnification
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4× fixed
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Objective Lens Diameter
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32 mm
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Optical Design
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Fixed‑power prism sight (no maintube)
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Reticle
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Green Crosshair 5.56 BDC (dual‑illuminated fiber optic / tritium)
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Illumination (ACOG)
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Auto fiber (day) / tritium (night); battery‑free
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Piggyback Optic
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Trijicon RMR® Type 2 LED Red Dot, 3.25 MOA (battery powered, CR2032)
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Eye Relief
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1.5″ (38 mm)
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Field of View @ 100 yd
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36.8 ft (7°)
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Exit Pupil
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8.1 mm
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Adjustment Click Value
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1/2 MOA per click
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Total Adjustment Range
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~40 MOA windage & elevation
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Parallax Focus
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Fixed at 100 m (≈109 yd)
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Overall Length
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~7.3″ assembled ECOS kit (approx. 5.8–6.2″ ACOG optic body)
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Weight
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~15.1 oz ACOG optic; ~20 oz class complete ECOS kit (ACOG + RMR + mount/irons)
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Finish / Color
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Cerakote® Flat Dark Earth (FDE)
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Waterproof / Fog‑Proof
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Sealed; nitrogen‑purged; service‑rated waterproof
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Shock Resistance
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Combat‑rated (duty calibers)
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Mount Interface
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Trijicon Quick‑Release Picatinny mount w/ integrated backup iron sights (included)
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Included Accessories (ECOS Kit Contents)
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4×32 ACOG (dual‑illum Green Crosshair 5.56 BDC)
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Trijicon RMR® Type 2 3.25 MOA Red LED (factory mounted)
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Trijicon QD Picatinny mount w/ integrated backup iron sights
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Lens cleaning tool
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Adjustment / hardware kit
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Trijicon logo sticker
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Owner’s manual & warranty documentation
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