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Trijicon 4x32 ACOG BAC Dual-Illuminated Riflescope (Red Crosshair Reticle for 300 Blackout, Matte Black)

BH #TRARCBB • MFR #TA31-C-100411
59 reviews
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Trijicon 4x32 ACOG BAC Dual-Illuminated Riflescope (Red Crosshair Reticle for 300 Blackout, Matte Black)
Key Features
  • Red Crosshair Reticle
  • Calibrated for 300 Blackout Ammunition
  • Tritium & Fiber Optic Illumination
  • Bindon Aiming Concept (BAC)
Dominate the field with Trijicon's 4x32 ACOG BAC Dual-Illuminated Riflescope. This almost-indestructible (7075-T6 aluminum alloy body) and self-powered (battery-free) Advanced Combat Optical Gunsight (ACOG) offers a low-distortion 4x optical system and an illuminated red Crosshair ballistic reticle to help you achieve your goals. The reticle is optimized for 300 Blackout ammunition and features a dual (tritium and fiber optic) illumination system that does not require any electrical power and can run for years. It automatically adapts to the environmental lighting conditions and delivers a highly visible reticle pattern. The optical system complies with the Bindon Aiming Concept (BAC), allowing you to aim with both eyes open. This ACOG provides a 1/2 MOA windage and elevation clicks, and ships with a TA51 mount for attachment to your firearm.
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Trijicon ACOG 4x32 Overview

Dominate the field with Trijicon's 4x32 ACOG BAC Dual-Illuminated Riflescope. This almost-indestructible (7075-T6 aluminum alloy body) and self-powered (battery-free) Advanced Combat Optical Gunsight (ACOG) offers a low-distortion 4x optical system and an illuminated red Crosshair ballistic reticle to help you achieve your goals. The reticle is optimized for 300 Blackout ammunition and features a dual (tritium and fiber optic) illumination system that does not require any electrical power and can run for years. It automatically adapts to the environmental lighting conditions and delivers a highly visible reticle pattern. The optical system complies with the Bindon Aiming Concept (BAC), allowing you to aim with both eyes open. This ACOG provides a 1/2 MOA windage and elevation clicks, and ships with a TA51 mount for attachment to your firearm.

Note:
Export of this device described herein is strictly prohibited without a valid export license issued by the U.S. Department of State Directorate of Defense Trade Controls, as prescribed in the International Traffic in Arms Regulations (ITAR), Title 22, Code of Federal Regulations, Parts 120-130, and/or by the U.S. Department of Commerce Bureau of Industry Security, as prescribed in the Export Administration Regulations (EAR), Title 15, Code of Federal Regulations, Parts 730-780. For further information contact the Directorate of Defense Trade Controls and/or the Bureau of Industry Security.
Optical Performance
  • 4x magnification
  • 32mm objective
  • Multi-coated optics
  • Low-distortion lenses
  • 7° angle of view
  • 8.1mm exit pupil
  • 1.5" eye relief
Use and Handling
  • Bindon Aiming Concept (BAC) allows aiming with both eyes open
  • 1/2 MOA impact point correction
Construction Details
  • Durable and lightweight 7075-T6 aluminum alloy
  • Corrosion-resistant (hard) anodized finish
  • Tested to withstand .22LR to .50BMG recoils
  • Water and fogproof
Reticle
  • Red Crosshair
  • For 300 Blackout firearms
  • Dual tritium and fiber optic illumination is battery-free
  • Does not require an external electrical power source
  • Reticle pattern is visible in most lighting conditions
UPC: 719307308282

Trijicon ACOG 4x32 Specs

Key Specs
Magnification
4x
Objective Lens Diameter
32 mm
Reticle Type
Reticle Type: 300 Blackout Crosshair
Self-Powered Illumination: Red
Mounting
Picatinny, Weaver
Optics
Magnification
4x
Objective Lens Diameter
32 mm
Exit Pupil Diameter
8.1 mm
Eye Relief
1.5" / 38 mm
Field of View
36.6' @ 100 yd / 12.2 m @ 100 m
Anti-Reflective Coatings
Yes, Multicoated
Fogproof
Yes
Reticle
Reticle Type
Reticle Type: 300 Blackout Crosshair
Self-Powered Illumination: Red
Adjustments
Impact Point Correction
Adjustment per Click: 1/2 MOA
Environmental
Environmental Resistance
Water-Resistant (Unrated)
General
Mounting
Picatinny, Weaver
Power Source
Tritium
Materials
Aluminum
Dimensions
5.9 x 2" / 15 x 5.1 cm
5.9 x 2.5" / 15 x 6.4 cm (with Mount)
Weight
10.5 oz / 297.5 g
Packaging Info
Package Weight
2.175 lb
Box Dimensions (LxWxH)
8.65 x 8.25 x 5.1"

Trijicon ACOG 4x32 Reviews

Excellent

By Craig
Rated 5 out of 5
Date: 2026-02-02

I've purchased products from B&H in the past, always great service, fast delivery and great price. The ACOG speaks for itself

Awesome optic combo

By Neil Patrick
Rated 5 out of 5
Date: 2025-08-01

Buit to military standards, tough as nails. This optic has been tried and true for 20 years. Add a modern RMR ontop, pretty sweet. I like the LED version as I can control or turn off when I choose. Sure you are a slave to a battery, but having that ability as opposed to a blaming over-bright Tridium light source is the pay payoff. Great eye relief, super quick acquisition both acog/rmr. It's fantastic for my competitions and everyday life.

See any errors on this page?

On Trijicon's web page the TA31RCO-M150CP has ...

On Trijicon's web page the TA31RCO-M150CP has tabs for mounting a RMR in your picture here it does not. So does it have them?
Asked by: William
The pictures you see on the B&H website are cut and copied from the manufacture website. It wiuld be the same product as seen ton the Trijicon website.
Answered by: John
Date published: 2023-05-23

Is the RMR a type 2, or type 1?

Is the RMR a type 2, or type 1?
Asked by: Blake
It is a type 2.
Answered by: Rob K
Date published: 2020-10-02

Does this model have bosses?

Does this model have bosses?
Asked by: Daniel
You can mount an RMR on your scope with BH #TRRM35. That is the part number you will find the RMR mount on the B&H website.
Answered by: John
Date published: 2020-02-27

question

Does this product come with lens covers just like the photo shows?
Asked by: Anonymous
Yes, the lens covers are included.
Answered by: Dana G.
Date published: 2018-08-27

Is the ilumination repairable?

Is the ilumination repairable?
Asked by: James
The tritium can be replaced by Trijicon by sending the optic in to them directly.
Answered by: Moe
Date published: 2021-12-31

Would I be able to remove the RMR and mount it on ...

Would I be able to remove the RMR and mount it on my pistol?
Asked by: Anwar
I can only verify that the Trijicon 4x32 ACOG Dual Illuminated Riflescope and 3.25 MOA Red Dot Type 2 RMR Sight Kit (DI .223 Red Chevron Reticle, Matte Black) BH #TR4X32RC223 • MFR #TA31-D-100549 Mounts on ACOG and comes with Trijicon ACOG Picatinny Rail Adapter
Answered by: John
Date published: 2022-05-22

question

How is this powered?
Asked by: Anonymous
By Fiber Optics.
Answered by: John P.
Date published: 2025-05-22

question

Specs say this RCO is designed for 14.5 inch barrel. Will it be ok on a 16 inch barrel? Trajectory of a 5.56 is pretty comparable regardless of barrel length I thought.
Asked by: H G.
The problem is one of velocity, not so much barrel length. Generally speaking the longer the barrel the higher the velocity. The difference in barrel length is 1 1/2 inch but remember that rarely does manufacturer specs match up with the actual velocity, too the outside temperature will affect the actual velocity. Unless you are a purist the difference is not worth worrying about. Also, the 223/5.56 is a very flat shooting cartridge, depending on the load and I am assuming a standard 55 grain load. With the right zero the bullet will never be more than 3 high or 3 low out to over 300 yards. If you hand load it would be a very easy matter to adjust the velocity if you felt the need to do so. Regardless of what ammo you shoot there will be variances in velocity unless you have match grade ammo. You can zero this scope wherever you want with the added benefit that it has range finding ability. By the way, the horizontal line is NOT for windage . . . . . the Chevron is used for that. The horizontal line is in Mil's . . . . . read the manual.
Answered by: Roger F.
Date published: 2018-08-27
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