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Questions & Answers
will it fit ar plat form not formula you're with this type over scope Expert Answer

The Trijicon ACOG 4x32mm ARMY Rifle Combat Optic uses a picatinny TA51 mount that will fit any flattop picatinny rail.

by Ethan, Gear Expert, December 30, 2022
Can you mount an RMR on top Expert Answer

The Trijicon ACOG 4x32mm ARMY Rifle Combat Optic for the M150 w/ TA51 Mount can have an RMR mounted on top using the Trijicon mount at the link below.
https://www.opticsplanet.com/trijicon-rmr-mount-for-acog-scopes-with-bosses.html

by Hunter, Gear Expert, December 5, 2022
Customer Reviews
Helpful Positive Review
Very clear and fast aquisition by David, Verified Owner, June 24, 2025
Just slap it on and your done. The lenses are clear and sharp. Great quality.
2/2 found this helpful
Helpful Positive Review
Trijicon ACOG by Gimpy, March 26, 2015
The optic is durable, battery free, reliable, and leaves room for the user to upgrade as they see fit. Its not the best optic for shooting 25 yards and in or 500 yards and out, but its one of the best pieces of glass that can do both if it has to. ...
Read More...
2/3 found this helpful
Helpful Positive Review
Trijicon ACOG 4x32mm M150 by Tac50bmg, August 5, 2015
Trijicon is the gold standard for illuminated tactical optics. This package was not cheap, but I received a large discount from Optics Planet in compassion to the list price. Optics Planet has great deals, so watch for them. Out of the box it was ...
Read More...
8/8 found this helpful
Helpful Positive Review
Trijicon 4x32 rco army green chevron by As Is, October 4, 2017
Small compact no batteries only if you mount a trijicon rmr which uses a 2032 coin battery I prefer the army version of the rco with green chevron with stadia reference on both sides of chevron the army rco version is the only one offered in green or...
Read More...
2/2 found this helpful
Helpful Positive Review
I added this scope to an Anderson AM15/M4 RF85 carbine in 5.56/223. The Tritium illumination in this scope is outstanding in low light situations. The green chevron Bindon sighting system makes for accurate shooting capability at all distances. I ...
Read More...
1/1 found this helpful
Most Recent Reviews
Acog is awesome by Chris W., Verified Owner, March 30, 2026
The kill flash was missing when I received this package but opticsplanet contacted trijicon and they sent a replacement quickly. Optic clarity is unmatched.
Read All 13 Reviews
Reticle:
Illuminated Green TA31RCO-M150CP-G Chevron
Illumination Color:
Green
Color:
Black
Weight:
16.2 oz
Adjustment Click Value:
1/2 MOA
Adjustment Type:
MOA
Illumination Type:
Fiber Optics/Tritium
Condition:
New

Code: TJ-RS-TA31RCO-M150CP-G-EE

MPN: TA31RCO-M150CP-G

UPC: 719307303423

List: $2,012.00Save 30%
$1,409.00

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Trijicon ACOG 4x32mm ARMY Rifle Combat Optic for the M150 w/ TA51 Mount

The Trijicon ACOG 4x32, ARMY Rifle Combat Optic (RCO) for the M150 w/ TA51 Mount TA31RCO-M150CP provides fast target acquisition and superb optical clarity. This Rifle Scope from Trijicon needs no tools for windage and elevation adjustments. The RCO-M150CP features external windage and elevation adjusters, making it waterproof up to 11m without caps.image

Trijicon's revolutionary Advanced Compact Optical Gunsight (ACOG), originally designed for the military, is now offered in a lightweight compact design. Available in a variety of reticle and magnification configurations, Trijicon Compact ACOG Gun Scope is ideally suited for a wide range of firearm applications and shooting situations. Trijicon Compact ACOG Day&Night Scope is the smaller, lighter weight and more compact version of full sized Trijicon ACOG Weapon Sight. Even with its reduced size, the Compact ACOG Rifle Scope by Trijicon delivers the same precision any-light aiming capabilities…the same accuracy... and the same tough, dependable performance as the original Trijicon ACOG Riflesight. At less than 6 ounces, Trijicon Compact ACOG BAC Scope Sight is perfect for fast-moving tactical teams operating in close quarters or for speed-oriented competition venues.

NOTE: No Rear Cover For This Product.

Specifications for Trijicon ACOG 4x32mm ARMY Rifle Combat Optic for the M150 w/ TA51 Mount:

Manufacturer: Trijicon
Objective Lens Diameter: 32 mm
Magnification: 4 x
Reticle: Illuminated Green TA31RCO-M150CP-G Chevron
Exit Pupil: 8 mm
Illumination Color: Green
Field of View, Linear: 36.8 ft at 100 yds
Field of View, Angle: 7 degrees
Eye Relief: 1.5 in
Color: Black
Weight: 16.2 oz
Adjustment Click Value: 1/2 MOA
Length: 7.3 in
Adjustment Type: MOA
Illumination Type: Fiber Optics/Tritium
Fabric/Material: Forged Aluminum
Optical Coating: Fully Multi-Coated
Water Resistance Level: Waterproof
Shockproof: Yes
Fogproof: Yes
Package Type: Polymer Hard Case
Magnification Type: Fixed
Condition: New
Country of Origin: USA
Housing/Frame Material: Forged Aluminum
Attachment Type: TA51

Features of Trijicon ACOG 4x32mm ARMY Rifle Combat Optic for the M150 w/ TA51 Mount:

  • Always On, Always Ready: Most ACOG models are battery-free, featuring a tritium/fiber optic illuminated reticle that automatically adjusts the brightness based on available light.
  • Take Control: Several ACOG models are designed with a user-adjustable brightness setting powered by a single AA battery. The 3.5x35 LED and 4x32 LED models both offer six adjustable brightness settings.
  • Rugged, Reliable Housing Design: Fixed-power design allows for minimal moving parts to create a nearly indestructible sighting system.
  • "Both Eyes Open" Design: "Both eyes open" shooting using Trijicon's Bindon Aiming Concept (BAC) feature allows for improved situational awareness.
  • Outstanding Clarity: The quality of the glass and multi-coated lenses maximize light-gathering capabilities and clear field of view with zero distortion.
  • Exact Target Distances & Holds: Most ACOG models feature a bullet drop compensating and target-ranging reticle for decisive aiming.
  • Combat Proven: No other magnified optic has been used more in combat than the ACOG.
  • Shock-Resistant: Proven to withstand recoil from a .22LR to a .50BMG and everything in between. Easily passes U.S. Military drop test requirements.
  • Waterproof: Exceptional waterproof performance that exceeds military standards. Dry nitrogen-filled to eliminate fogging. This optic is tested to withstand and perform in extreme cold and heat with dry-nitrogen filled housing that mitigates fogging.

Package Contents:

  • Trijicon ACOG 4x32mm ARMY Rifle Combat Optic for the M150 w/ TA51 Mount
  • Thumbscrew Flattop Adapter (TA51)
  • killFlash Anti-Reflection Device (TA91)
  • Objective & Eyepiece Flip Cap Set
  • LENSPEN (TA56)
  • Lanyard Assembly for Adjuster Caps (TA71E)
  • Trijicon Logo Sticker (PR15)
  • RCO Manual
  • Warranty Card

Trijicon ACOG 4x32mm ARMY Rifle Combat Optic for the M150 w/ TA51 Mount Orderable Models

List of Orderable Models

  • Trijicon ACOG 4x32 Illuminated Rifle Scope - Green Chevron Reticle, for M150, Black w/ TA51 Mount , MPN: TA31RCO-M150CP-G , UPC: 719307303423 , Code: TJ-RS-TA31RCO-M150CP-G-EE

Trijicon ACOG 4x32mm ARMY Rifle Combat Optic for the M150 w/ TA51 Mount Unavailable & Discontinued Models

List of Unorderable Models

  • Demo, Trijicon ACOG 4x32 Illuminated Rifle Scope - Green Chevron Reticle, for M150, Black w/ TA51 Mount , MPN: 100229-DEMO , Code: TJ-RS-TA31RCO-M150CP-G-DEMO
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