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Questions & Answers
Will this sight work with the manual sights mounted on my Colt AR-15. Expert Answer

Yes, the Trijicon 4x32 ACOG Rifle Scope will still work as intended with fixed sights on your AR15. Your front sight will be out of focus when looking through the optic.

by Ethan, Gear Expert, June 25, 2024
What is the difference between the 100558 model and the 100564 model. They both have crosshair reticles and the RMR mounted towards the front. Expert Answer

The Trijicon 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR model TA02-C-100564 comes with the adjustable RMR Type 2 model RM06. The Trijicon 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR model TA02-C-100558 comes with the non adjustable RMR Type 2 model RM01.

by Hunter, Gear Expert, March 3, 2023
Customer Reviews
Helpful Positive Review Best of both worlds by Shane, Verified Owner, January 18, 2024
I was between an RMR and scope - this is the best of both. Quality materials, a little heavier than I thought, but no regrets. Would buy it again.
1/1 found this helpful
Helpful Positive Review ACOG/RMR combo by Trey, Verified Owner, April 16, 2024
Worth every penny, exactly what I expected from Trijicon. Would buy again.
1/1 found this helpful
Helpful Positive Review Trijicon ACOG 4x32 green chevron w/ RMR by Ric, Verified Owner, February 14, 2025
Love this product. Been to the range twice, once to site in the ACOG itself and a second time to dial in the RMR. Shooting 1" groups at 100 yards with the ACOG, and placing 3 shot groups in the bullseye at 50 yards with the RMR. Not sure why I don...
Read More...
1/1 found this helpful
Helpful Positive Review Trijicon 4x32 ACOG 4irl3wdop3 2/ Colt knob thumbscrew and Red Dot RMR by Harold, February 6, 2018
This scope was dead on after sighting it in. Durable and lightweight. Love the way it looks on top of my LWCR AR15 and the accuracy of my shot groups. Definitely recommend it to anyone considering a new scope! Optics Planet also afforded me the b...
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16/17 found this helpful
Helpful Positive Review fantastic optic by jim, March 11, 2019
exactly what i expected and the price was unbeatable. glass is unbelievably clear and the chevron is bright when it needs to be and dim when it needs to be , having the rmr mounted on top makes a huge difference when shooting close targets
8/10 found this helpful
Most Recent Reviews Good scope by Kh, Verified Owner, June 10, 2025
Scope was better than I expected. Easy to install and it has been running well. Struggled initially with putting in the double a battery. Overall it is good but it is also expensive.
Read All 9 Reviews
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Product Info for Trijicon 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR

Go from close quarters combat to long distance targeting instantly using this Trijicon 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR. These Fixed Power Rifle Scopes designed by Trijicon use fiber optics and tritium for a bright aiming point that's easily viewable in any lighting conditions. This Trijicon 4x32 Illuminated ACOG Rifle Scope/Red Dot RMR is housed in forged aluminum for premium durability that boasts lightweight properties. Quickly acquire targets with the mounted Red Dot RMR. When you see a target in the distance, switch your focus down the ACOG Rifle Scope for enhanced zoom and precise alignment. With impressively clear multi-coated glass, you'll be able to pinpoint every detail in the field with remarkable accuracy. Experience one of the most versatile optics on the market with this Trijicon 4x32 3.25 MOA ACOG Rifle Scope/Red Dot RMR.image

The reticle will appear black during the daytime and will glow amber in the dark, thanks to Trijicon's patented tritium illumination.

Specifications for Trijicon 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR:

Manufacturer: Trijicon
Objective Lens Diameter: 32 mm
Magnification: 4 x
Reticle Focal Plane: Second Focal Plane (SFP)
Exit Pupil: 8 mm
Field of View, Linear: 36.8 ft at 100 yds
Eye Relief: 1.5 in
Weight: 15.1 oz
Adjustment Click Value: 0.5 MOA
Length: 5.8 in
Adjustment Type: MOA
Caliber: 6.8mm Remington SPC, .300 AAC Blackout, .223 Remington
Battery Type: AA
Width: 2 in
Fabric/Material: Forged Aluminum
Adjustment Range: 40 MOA
Lens Material: Glass
Optical Coating: Multi-Coated
Brightness Settings: 6
Battery Life: 12000 hours
Water Resistance Level: Waterproof
Water Resistant Mark: 100 m
Shockproof: Yes
Fogproof: Yes
Battery Quantity: 1
Package Type: Polymer Hard Case
Magnification Type: Fixed
Condition: New
Projectile Caliber: .223 Caliber
Country of Origin: USA

Features of Trijicon 4x32 ACOG Rifle Scope w/ Red Dot RMR:

  • 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;
  • "BOTH EYES OPEN" DESIGN: "Both eyes open" shooting using Trijicon's Bindon Aiming Concept (BAC) feature allows for improved situational awareness;
  • COMBAT PROVEN: No other magnified optic has been used more in combat than the ACOG;
  • 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;
  • OUTSTANDING CLARITY: The quality of the glass and multi-coated lenses maximize light-gathering capabilities and clear field of view with zero distortion;
  • SHOCK-RESISTANT: Proven to withstand recoil from a .22LR to a .50BMG and everything in between. Easily passes U.S. Military drop test requirements;
  • RUGGED, RELIABLE HOUSING DESIGN: Fixed-power design allows for minimal moving parts to create a nearly indestructible sighting system;
  • EXACT TARGET DISTANCES & HOLDS: Most ACOG models feature a bullet drop compensating and target-ranging reticle for decisive aiming;
  • 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 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR
  • 3.25 MOA Trijicon RMR Type 2
  • Thumbscrew Flattop Adapter (TA51)
  • LENSPEN (TA56)
  • Lanyard Assembly for Adjuster Caps (TA71E)
  • Trijicon Logo Sticker (PR15)
  • ACOG BAC Manual
  • Warranty Card

Trijicon 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR Orderable Models

List of Orderable Models

Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Green Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100552 , MPN: TA31-C-100552 , UPC: 719307311800 , Code: TJ-RS-ACG4-100552
Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100550 , MPN: TA31-C-100550 , UPC: 719307311787 , Code: TJ-RS-ACG4-100550
Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Green Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100548 , MPN: TA31-D-100548 , UPC: 719307311763 , Code: TJ-RS-ACG4-100548
Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100549 , MPN: TA31-D-100549 , UPC: 719307311770 , Code: TJ-RS-ACG4-100549
Trijicon 4x32 ACOG Rifle Scope, LED Red Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & Adjustable LED 3.25 MOA Red Dot RMR Type 2, Black, 100564 , MPN: TA02-C-100564 , UPC: 719307311947 , Code: TJ-RS-ACG4-100564
Trijicon 4x32 ACOG Rifle Scope, LED Red Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100558 , MPN: TA02-C-100558 , UPC: 719307311862 , Code: TJ-RS-ACG4-100558
Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Cerakote FDE, 100570 , MPN: TA31-D-100570 , UPC: 719307312005 , Code: TJ-RS-ACG4-100570
Trijicon 4x32 ACOG Rifle Scope, Center Illuminated Amber Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100556 , MPN: TA01-D-100556 , UPC: 719307311848 , Code: TJ-RS-ACG4-100556
Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Amber Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100551 , MPN: TA31-C-100551 , UPC: 719307311794 , Code: TJ-RS-ACG4-100551
Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Cerakote Gray, 100568 , MPN: TA31-D-100568 , UPC: 719307311985 , Code: TJ-RS-ACG4-100568
Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Cerakote OD Green, 100569 , MPN: TA31-D-100569 , UPC: 719307311992 , Code: TJ-RS-ACG4-100569

Trijicon 4x32 ACOG Rifle Scope w/ Colt Knob Thumbscrew Mount and Red Dot RMR Unavailable & Discontinued Models

List of Unorderable Models

DEMO, Trijicon 4x32 ACOG Rifle Scope, Center Illuminated Amber Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100556 , MPN: 100556-DEMO , Code: TJ-RS-ACG4-100556-DEMO
Demo, Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100549 , MPN: TA31-D-100549-DEMO , Code: TJ-RS-ACG4-100549-DEMO
DEMO, Trijicon 4x32 ACOG Rifle Scope, LED Red Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100558 , MPN: 100558-DEMO , Code: TJ-RS-ACG4-100558-DEMO
DEMO, Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Black, 100550 , MPN: TA31-C-100550-DEMO , Code: TJ-RS-ACG4-100550-DEMO
DEMO, Trijicon 4x32 ACOG Rifle Scope, LED Red Crosshair .223 Reticle w/ Colt Knob Thumbscrew Mount & Adjustable LED 3.25 MOA Red Dot RMR Type 2, Black, 100564 , MPN: 100564-DEMO , Code: TJ-RS-ACG4-100564-DEMO
DEMO, Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Cerakote OD Green, 100569 , MPN: 100569-DEMO , Code: TJ-RS-ACG4-100569-DEMO
DEMO, Trijicon 4x32 ACOG Rifle Scope, Dual Illuminated Red Chevron .223 Reticle w/ Colt Knob Thumbscrew Mount & LED 3.25 MOA Red Dot RMR Type 2, Cerakote FDE, 100570 , MPN: 100570-DEMO , Code: TJ-RS-ACG4-100570-DEMO
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