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Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

Amber Crosshair Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

OVERVIEW

Adapted from the battlefields, US Forces have begun improving this proven Trijicon ACOG scope by adding a small red dot sight on top for close encounter missions. Trijicon has now created a similar model for the public, the TA31-C-100551. The main Trijicon scope provides a dual-illuminated reticle using fiber optics and tritium for bright aiming point in any light condition. The ranging reticle allows for bullet drop compensation out to 800 meters without any manual adjustments. A Trijicon RMR Type 2 sits on top with a 3.25 MOA aiming dot.

TA31-C-100551 reticle image

INCLUDES

    3.25 MOA Trijicon RMR Type 2 Attached with Mount
    Thumbscrew Flattop Adapter (TA51)
    LENSPEN (TA56)
    Lanyard Assembly for Adjuster Caps (TA71E)
    Trijicon Logo Sticker (PR15)
    ACOG BAC Manual
    Warranty Card

SKU: TA31-C-100551

RETAIL: $2,640.00

FIND A DEALER

Adapted from the battlefields, US Forces have begun improving this proven Trijicon ACOG scope by adding a small red dot sight on top for close encounter missions. Trijicon has now created a similar model for the public, the TA31-C-100551. The main Trijicon scope provides a dual-illuminated reticle using fiber optics and tritium for bright aiming point in any light condition. The ranging reticle allows for bullet drop compensation out to 800 meters without any manual adjustments. A Trijicon RMR Type 2 sits on top with a 3.25 MOA aiming dot.

ALWAYS ON, ALWAYS READY

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

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

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” DESIGN

“Both eyes open” shooting using Trijicon's Bindon Aiming Concept™ (BAC) feature allows for improved situational awareness.

OUTSTANDING CLARITY

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

EXACT TARGET DISTANCES & HOLDS

Most ACOG models feature a bullet drop compensating and target-ranging reticle for decisive aiming.

COMBAT PROVEN

COMBAT PROVEN

No other magnified optic has been used more in combat than the ACOG.

SHOCK-RESISTANT

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

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.

INDUSTRY-LEADING RESEARCH, DESIGN & TESTING

We are engineers at heart, like our founder, Glyn Bindon. Therefore, we are bound by a commitment to seek innovative aiming solutions that constantly redefine “brilliant.” This legacy of innovation is fed by what we call The Science of Brilliant®.

LEARN MORE ABOUT THE SCIENCE OF BRILLIANT® 

TESTING PROCEDURES INCLUDE:

Alaska to Africa Tested Immersion Tested Solid Zero Tested Vibration Tested Drop Tested
Length x Width x Height
5.98 in x 2 in x 2.3 in
(151.89mm x 50.8mm x 58.42mm)
Weight
17 oz. (481.94g)
Magnification
4x
Objective Size
32mm
Reticle Pattern
Crosshair
Day Reticle Color
Amber
Night Reticle Color
Amber
Bullet Drop Compensating (BDC)
Yes
Caliber
0.223
Bindon Aiming Concept™ (BAC)
Yes
Illumination Source
Fiber Optics & Tritium
Power Source
Fiber Optics & Tritium
Eye Relief
1.5 in. (38.1mm)
Exit Pupil
0.32 in. (8.13mm)
Field of View (degrees)
7°
Field of View (feet)
36.8 ft. @ 100 yds. (12.27m @ 100m)
Mount
Flattop Thumbscrew Mount (TA51)
Housing Material
Forged Aluminum
Finish
Matte Black
Submersion Depth
-66 ft. (-20m)

ACOG Spec Sheet

Download ACOG Spec Sheet DOWNLOAD

ACOG Reticle Dimensions

Download ACOG Reticle Dimensions DOWNLOAD

ADDITIONAL OPTIONS 2

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-C-100552

Green Crosshair Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

Retail: $2,640.00

DETAILS

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-C-100550

Red Crosshair Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

Retail: $2,640.00

DETAILS

Trijicon 3x30 Compact ACOG® Scope w/ Trijicon RMR® - 5.56x45mm / 62gr.

TA33-C-400394

Dual Illuminated Green Horseshoe/Dot 5.56x45mm/62gr. Ballistic Reticle w/Mount with Trijicon Q-LOC™ Technology & Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,529.00

DETAILS

Trijicon 3x30 Compact ACOG® Scope w/ Trijicon RMR® - 5.56x45mm / 62gr.

TA33-C-400395

Dual Illuminated Amber Horseshoe/Dot 5.56x45mm/62gr. Ballistic Reticle w/ Mount with Trijicon Q-LOC™ Technology & Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,529.00

DETAILS

Trijicon ACOG® 4x32 BAC ECOS Riflescope with Trijicon RMR® -.223 BDC

TA31-D-100553

Red Crosshair Reticle w/ Backup Iron Sights, FDE, Quick Release Mount & Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,533.00

DETAILS

Trijicon ACOG® 4x32 BAC ECOS Riflescope with Trijicon RMR® -5.56 BDC

TA31-D-100554

Green Crosshair Reticle, Backup Iron Sights, FDE, Quick Release Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,533.00

DETAILS
NEW FOR 2026

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RCR® -.223 BDC

TA31-C-100813

Red Chevron Reticle, Thumbscrew Mount, Adjustable LED 3.25 MOA RCR® Red Dot

RETAIL: $2,586.00

DETAILS

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-D-100548

Green Chevron Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,611.00

DETAILS

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-D-100549

Red Chevron Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,611.00

DETAILS

Trijicon ACOG® 6x48 BAC Riflescope w/ Trijicon RMR® -.308 BDC

TA648-D-100560

Red Chevron Reticle, Thumbscrew Mount & Automatic LED 6.5 MOA Red Dot RMR® Type 2

RETAIL: $4,366.00

DETAILS

Trijicon ACOG® Extra High Mount with Trijicon Q-LOC™ Technology

AC12044

RETAIL: $246.00

Trijicon ACOG® & VCOG® Mount with Trijicon Q-LOC™ Technology

AC12042

RETAIL: $212.00

Trijicon Cantilever Mount with Trijicon Q-LOC™ Technology for ACOG® and VCOG®

AC12043

RETAIL: $212.00

Trijicon Compact ACOG® Mount with Trijicon Q-LOC™ Technology

AC12041

RETAIL: $212.00

COMPATIBLE ACCESSORIES 13

Trijicon 3x30 Compact ACOG® Scope w/ Trijicon RMR® - 5.56x45mm / 62gr.

TA33-C-400394

Dual Illuminated Green Horseshoe/Dot 5.56x45mm/62gr. Ballistic Reticle w/Mount with Trijicon Q-LOC™ Technology & Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,529.00

DETAILS

Trijicon 3x30 Compact ACOG® Scope w/ Trijicon RMR® - 5.56x45mm / 62gr.

TA33-C-400395

Dual Illuminated Amber Horseshoe/Dot 5.56x45mm/62gr. Ballistic Reticle w/ Mount with Trijicon Q-LOC™ Technology & Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,529.00

DETAILS

Trijicon ACOG® 4x32 BAC ECOS Riflescope with Trijicon RMR® -.223 BDC

TA31-D-100553

Red Crosshair Reticle w/ Backup Iron Sights, FDE, Quick Release Mount & Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,533.00

DETAILS

Trijicon ACOG® 4x32 BAC ECOS Riflescope with Trijicon RMR® -5.56 BDC

TA31-D-100554

Green Crosshair Reticle, Backup Iron Sights, FDE, Quick Release Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,533.00

DETAILS
NEW FOR 2026

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RCR® -.223 BDC

TA31-C-100813

Red Chevron Reticle, Thumbscrew Mount, Adjustable LED 3.25 MOA RCR® Red Dot

RETAIL: $2,586.00

DETAILS

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-C-100550

Red Crosshair Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,640.00

DETAILS

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-C-100552

Green Crosshair Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,640.00

DETAILS

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-D-100548

Green Chevron Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,611.00

DETAILS

Trijicon ACOG® 4x32 BAC Riflescope w/ Trijicon RMR® -.223 BDC

TA31-D-100549

Red Chevron Reticle, Thumbscrew Mount, Automatic LED 3.25 MOA Red Dot RMR® Type 2

RETAIL: $2,611.00

DETAILS

Trijicon ACOG® 6x48 BAC Riflescope w/ Trijicon RMR® -.308 BDC

TA648-D-100560

Red Chevron Reticle, Thumbscrew Mount & Automatic LED 6.5 MOA Red Dot RMR® Type 2

RETAIL: $4,366.00

DETAILS

Trijicon ACOG® Extra High Mount with Trijicon Q-LOC™ Technology

AC12044

RETAIL: $246.00

Trijicon ACOG® & VCOG® Mount with Trijicon Q-LOC™ Technology

AC12042

RETAIL: $212.00

Trijicon Cantilever Mount with Trijicon Q-LOC™ Technology for ACOG® and VCOG®

AC12043

RETAIL: $212.00

Trijicon Compact ACOG® Mount with Trijicon Q-LOC™ Technology

AC12041

RETAIL: $212.00

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