Trijicon ACOG 4x32 Scope FDE with RMR Type 2 - Dual Illuminated Crosshair - Red

Manufactured by Trijicon
Manufactured by Trijicon
2 Reviews

Out of Stock



The Trijicon ACOG brings precision aiming and close quarters speed together in an advanced, combat-ready, and compact package. Extremely durable, these proven combat optics feature dual-illuminated reticles lit by fiber-optic for daylight illumination and tritium for low light operations. Offering unparalleled field of view, simplicity, and glass clarity, the ACOG is the ultimate do-everything optic for the modern sporting or combat rifle.

  • Expansive field of view
  • Superior optical clarity
  • Reticle illuminated by fiber optics and tritium
  • Bomb-proof construction
  • Compatible with standard ACOG mounts
  • Quick release mount

  • RMR01 Type 2 LED illuminated red dot with 3.25 MOA reticle
  • Trijicon Quick Release Mount
  • Integrated backup iron sights
  • Manual
  • Warranty Card
  • Trijicon Logo Sticker

The TA31 ECOS is a fixed 4x optic designed to provide fast hits at close quarters with both eyes open, as well as precise fire at range. The passively illuminated crosshair reticle features bullet drop and ranging out to 1000 meters with standard 55-grain 5.56 NATO and is tuned specifically for 20" barrels. A Trijicon RM01 LED Red Dot piggy backed provides instant acquisition for close quarters.
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Click Value1/2 MOA
Exit Pupil Diameter8.00 mm
Eye Relief1.50 in
Field View 10036.80 ft
Focal PlanePrism Scope
Night Vision CompatibleNon-Compatible
Objective Diameter32mm
ReticleTrijicon Crosshair with M16 BDC
Reticle TypeBDC
Tube DiameterNot Applicable
Weight15 Oz

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

2 reviews

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One of the best optic combos ever

by -

Best decision I've made for optics. Absolutely perfect for 16"-18" combat rifles. The BDC says it's for 20" but was well within minute of man at 500 yards on a 16" with M855 and 1:7 twist, at 600-700 you're approaching the effectiveness of the round anyway. Glass is unreal as is the case with most Trijicons. Mount was solid and held zero after several unmount/remounts, at most a 1/4" poi shift, and if 1/4" moa is the make-or-break you're a better shooter than me. Red dot is RMR type 1 so no "off" switch but Trijicon says 5+ years in dark storage. Built-in Irons are definitely for 25 yards and in but can definitely put hits on target at 50 yards. Wish I had bought this combo earlier. If it becomes available again just do it, you won't be disappointed.

Updated about two years later


Thing is a tank, still just dead on all the time. Drops, dismounts, bumps, you name it. It eventually landed on a 16" barrel with a 1:7 and I've gone to running 77gr OTM. I'm getting 2485fps, I zero'd the optic for 50 yards due to the heavier round, and honestly, my dudes, thing is amazing for 400 yards and in. The BDC holds for that ammo/barrel/zero are point of aim at 50, 7/8" high at 100, 211yards for the 200 hold mark, 294 yards for the 300 yard hold mark, and 384 yards at the 400 yard hold. With 4x you're hitting steel at 400 or less without even trying. The point is that with good ammo instead of M855 or M193 this optic will make your gun more effective than you think it is. I switched the RM01 Type 2 that comes with it for the RM06 Type 2 adjustable version so I could turn the dot up, down, and off but that was just personal preference. I stand by my original review, just suck it up and buy it.