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TA31RCO-A4CP Trijicon ACOG TA31RCO-A4CP 4x32 Dual Illuminated Red Chevron USMC Rifle Combat Optic w/TA51

Manufacturer: Trijicon
SKU: TRI100226
Manufacturer part number: TA31RCO-A4CP
UPC: 719307302068
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The TA31RCO is an Advanced Combat Optical Gunsight (ACOG) designed for the USMC's M16A4 weapon system (20” barrel). It incorporates dual illumination technology using a combination of fiber optics and self-luminous tritium. This allows the aiming point to always be illuminated without the use of batteries. The tritium illuminates the aiming point in total darkness, and the fiber optic self-adjusts reticle brightness during daylight according to ambient light conditions. This allows the operator to keep both eyes open while engaging targets and maintaining maximum situational awareness. Designed to the exact specifications of the United States Marine Corps, the unique reticle pattern provides quick target acquisition at close combat ranges while providing enhanced target identification and hit probability out to 800 meters utilizing the Bullet Drop Compensator. No tools are needed for windage and elevation adjustments because the TA31RCO features external adjusters, making it waterproof up to 11m without the caps. Mounting bosses are integrated into the housing by the eyepiece to allow the easy addition of a Trijicon RMR® (not included).


  • Thumbscrew Flattop Adapter (TA51)
  • Thumb Screw (for mounting to carry handle) (TA53A)
  • killFlash Anti-Reflection Device (TA91)
  • Scopecoat (TA96)
  • LENSPEN (TA56)
  • Lanyard Assembly for Adjuster Caps (TA71E)
  • Trijicon Logo Sticker (PR15)
  • RCO Manual
  • Warranty Card


  • Always-On, Always Ready
  • Rugged, Reliable Housing Design
  • “Both Eyes Open” Design
  • Outstanding Clarity
  • Exact Target Distances & Holds
  • Combat Proven
  • Shock-Resistant
  • Waterproof

Weight:15.8 oz. (447.92g)
Objective Size:32mm
Reticle Pattern:Chevron
Day Reticle Color:Red
Night Reticle Color:Red
Bullet Drop Compensating (BDC):Yes
Caliber:0.223 (20 in. barrel)
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):
Field of View (feet):36.8 ft. @ 100 yds. (12.27m @ 100m)
Mount:Flattop Thumbscrew Mount (TA51)
Housing Material:Forged Aluminum
Finish:Matte Black
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