TA31RCO-M4CP - the USMC's Rifle Combat Optic

The TA31RCO is an Advanced Combat Optical Gun sight (ACOG) for the flat-top M4 carbine (14.5″ barrel) used with M855 ball ammunition.  It has been adopted and purchased by the United States Marine Corps in vast numbers as the AN/PVQ-31B (M4).  The USMC specified the ballistic compensating reticle to enable Marines to rapidly acquire targets at close range yet deliver precision fire out to 800 meters (USMC notes on use of this sight).


TA31RCO-M4CP reticle
Bullet drop aiming reticle of TA31RCO-M4CP

The AN/PVQ-31B incorporates dual-illumination technology using a combination of fiber optics and self-luminous tritium. This provides appropriate, perpetual illumination of the reticle without the need for batteries or the possibility of elecrical failure.  The ACOG allows the shooter to keep both eyes open for maximum situational awareness.  For CQB an RMR top mounted red dot sight can be added.

Trijicon are an American manufacturer that has won a huge share of the world market for rugged and compact magnifying weapon sights.  Trijicon ACOG sights are the standard by which other manufacturers’ products are judged and have become standard issue to the armed forces of the United States, United Kingdom and Israel among others.

NSN 1240-01-534-1114 (M4)
US DoD designation AN/PVQ-31B

The TA31RCO-M4CP comes supplied with:

  • 1 Thumbscrew Flattop Adapter (TA51)
  • 1 RCO 4×32 ACOG Pouch (TA86)
  • 1 4×32 RCO killFLASH®
  • 1 Adjuster Cap Lanyards
  • 1 4×32 Scopecoat (TA96)
  • 1 Lenspen (LENSPEN)
  • 1 Trijicon Logo Sticker (PR15)
  • 1 RCO Manual
  • 1 Warranty Card
Magnification 4
Objective Size 32
Bullet Drop Compensator Yes
Length (in) 5.80
Weight (oz) 9.90
Illumination source Fiber Optics & Tritium
Reticle Pattern Chevron w/ Target Reference System
Day Reticle Color Red
Night Reticle Color Red
Calibration 5.56X45mm M855 from flat-top M4
Bindon Aiming Concept Y
Eye Relief (in) 1.50
Exit Pupil (mm) 8.00
Field of View (°) 7.00
Field of View @ 100yrds (ft) 36.80
Adjustment @ 100 yds (clicks/in) 3.0
Tube Size N/A
Mount TA51
Mount On/Comes With Flattop
Housing Material Forged Aluminum
Special Order No

Check the price of the Trijicon TA31RCO-M4CP at Brownells, a name you can trust.

Full disclosure: If you purchase an TA31RCO-M4CP from Brownells I will receive an affiliate commission which will help keep this site online and will not affect your purchase price.

This entry was posted in Trijicon and tagged . Bookmark the permalink.