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Trijicon ACOG 4x32 USMC Combat Optic TA31RCO-M4CP


M4/M16 - TA51 Mount

List Price $1,776.00
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With over one million produced, Trijicon’s Advanced Combat Optical Gunsight, better known as the ACOG has become iconic in the realm of combat optics — and for good reason, the ACOG has an unquestioned reputation for quality and reliability. The Trijicon ACOG is the official medium range weapon sight for both U.S. Special Operations Forces and the Marine Corps as well as being the optic of choice for law enforcement agencies across the country. What sets the ACOG apart from the pack is what it offers to its users, increased hit potential regardless of light conditions. This is due to the tritium/fiber optic illuminated reticle found in most Trijicon ACOG riflescopes, this automatically adjusts illumination of the reticle based on available light. With a wide array of magnification levels, reticle designs, and reticle colors available — there truly is an ACOG for every mission.

Trijicon ACOG riflescopes come in the following magnification levels:

1.5x16, 1.5x24, 2x20, 3x24, 3x30, 3.5x55, 4x32, 5.5x50, and 6x48.


Superior Quality Glass Lenses
Multi-coated lenses provide superior clarity and light transmitting capabilities with zero distortion.
Rugged Aluminum-Alloy Housing
Forged 7075-T6 aircraft aluminum-housing provides for a nearly indestructible sighting system.
Fixed Magnification
Less moving parts than a variable optic equals increased durability and reliability. Seven magnification levels are available.
Waterproof up to 100 Meters
Dry-nitrogen filled to eliminate fogging. Five times more waterproof than military standard requirements.
Both Eyes Open Design
The ACOG can be used as a CQB sight when shooting both eyes open utilizing the Bindon Aiming Concept.


  • Item ConditionNew
  • Scope Weight:15.8 oz. with mount and ARD
  • Scope Length:6.7"
  • Magnification Range:4x
  • Scope Objective Diameter:32mm
  • Turret Adjustment (Click Value):2 clicks/inch @ 100 yards
  • Parallax Adjustment:Fixed
  • Reticle Details:Red Chevron Reticle
  • Field of View:
    36.8 ft @ 100 yards
  • Exit Pupil:8.1 mm
  • Eye Relief:1.5"
  • Illuminated Reticle:Yes
  • Scope Finish:Black
  • Product TypeRiflescopes
  • UPC719307302075
  • MPN100230

Customer Reviews

Average Rating
March 11, 2018

Great scope with great glass.

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November 25, 2022

It’s everything that I expected it to be! Great price and really fast shipping.

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November 17, 2022

The clarity of the glass in this scope is unprecedented. The fit and finish is on the same level as a Night Force or US Optics. THE BEST. To have a Trijicon ACOG mounted on my custom AR is a great feeling when shooting at the range.

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July 4, 2022

TRIJICON ACOG RCO Best battle ready optic in every way. Europtic The finest optics provider in this world.

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June 1, 2022

Great product! Very Durable.

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January 30, 2022

Buy with confidence. Quick shipping with tracking. Legit product comes NIB. registers with Trijicon for warranty.

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January 13, 2022

Lots of folks talking about how the ACOG is outdated or overrated, but in my opinion it is still one of the best options out there for a fighting rifle. Of course Eurooptics shipped fast and I can't seem to beat there prices anywhere, even from distributors. Happy as heck with my new carbine setup.

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September 15, 2021

Excellent product and excellent service!!! Been a customer of Europtics for years and I am never disappointed with the Customer Service from sales to fulfillment!!!

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February 2, 2019

Fast shipping, great optic, what more do you want?

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January 18, 2019

I love my ACOG. It sits atop my FN 15 and points the way, sure and true.

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January 9, 2019

Fantastic scope for the best price I could find BY FAR. Scope is brand new, shipping was fast (three days across continental US), absolutely zero complaints. Will be shopping here again soon.

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December 11, 2018

This product Mets my needs, very durable, easy to use and fantastic materials used. Also awesome price range.

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September 15, 2018

Price was great and delivery was quick. The Optics are fantastic and spot on right out of the box. for the longer shots very easy to adjust and again spot on. Could not be happier.

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August 19, 2018

Genuine Trijicon ACOG, fast delivery at the best price I could find.

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April 8, 2018

Fantastic optic that has been on my hit list for a few years. Euro Optic also had the best price on the market. Fast delivery as well.

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