Trijicon ACOG TA31RCO-M4CP: 4x32 BAC Rifle Combat Optic (RCO) Scope w/ Red Chevron Reticle

Trijicon ACOG TA31RCO-M4CP: 4x32 BAC Rifle Combat Optic (RCO) Scope w/ Red Chevron Reticle

Trijicon ACOG 4x32 BAC Rifle Combat Optic (RCO) Scope with Red Chevron Reticle for the USMC's M4 and M4A1 with Thumbscrew Mount

The TA31RCO by Trijicon is designed for the M4 and M4A1 weapon systems that use a 14.5” barrel. The Advanced Combat Optical Gunsight (ACOG) uses dual illumination technology that combines self-luminous tritium and fiber optics for maximum efficiency. Because the tritium is used, it means that the aiming point will always be illuminated whether the batteries are in place or not. Even in total darkness you will see the aiming point and the fiber optic will self-adjust the reticle brightness under all types of lighting conditions for maximum visibility. With this technology, you can keep both eyes open while engaging the target and maintain your situational awareness at the same time.

The TA31RCO is designed to fit the exact specification as dictated by the US Marines, including the reticle patter that provides for a very quick acquisition of the target at close range while offering an enhanced identification of the target at ranges out to 800 meters thanks to the Bullet Drop Compensator.

You do not need to use any tools for adjusting windage or elevation thanks to the external adjusters of the device. In addition, the TA31RCO is waterproof up to 11 meters without the caps which means that it can withstand the elements. There are also mounting bosses which are integrated into the housing itself by the eyepiece. This allows for the addition of the Trijicon RMR which is not included with this kit.


  • (TA51) Thumbscrew Flattop Adaptor for use with Picatinny Rail
  • (TA91) killFLASH Anti-Reflection Device
  • (TA56) LENSPEN
  • (TA71E) Lanyard Assembly for Adjustor Caps
  • RCO Manual
  • (PR15) Trijicon Logo Sticker
  • Warranty Card


  • 4x Magnification
  • 32mm Objective Size
  • Bullet Drop Compensator
  • 6.7” Length w/ARD
  • 15.8 oz Weight w/ARD and mount
  • 1.5” Eye Relief
  • 8mm Exit Pupil
  • 36.8 per 100 yards Field of View
  • 7 Degrees Field of View
  • 2 clicks per 100 yard Adjustment
  • Fiber Optics and Tritium Illumination Source
  • Chevron with Target Reference System Reticle Pattern
  • Red Day & Night Reticle Color
  • .233 Calibration
  • Bindon Aiming Concept

The mount itself comes with a TA51 Flattop Thumbscrew Mount and the housing material is crafted from forged aluminum for maximum protection.



Magnification 4x
Objective Size (mm) 32
Bullet Drop Compensator Yes
Length (in) 6.7 in.
(with ARD)
Weight (oz) 15.8 oz.
(with mount and ARD)
Illumination Source Fiber Optics & Tritium
Reticle Pattern Chevron w/ Target Reference System
Day Reticle Color Red
Night Reticle Color Red
Calibration 0.223 (14.5 in. barrel)
Bindon Aiming Concept Yes
Eye Relief (in) 1.5
Exit Pupil (mm) 8
Field of View (Degrees) 7
Field of View @ 100 yards (ft) 36.8
Adjustment @ 100 yards (clicks/in) 2
Mount Comes With Flattop Thumbscrew Mount (TA51)
Housing Material Forged Aluminum





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UPC Code: 719307302075
Price: $1,466.00

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