Trijicon ACOG 4x32 Scope .223 Ballistic Reticle w/ TA51 Mount - TA31-CH

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Trijicon ACOG 4x32 Scope Dual Illuminated .223 Ballistic Reticle w/ TA51 Mount - TA31-CH


Quick Overview

SKU: 5165458124
UPC: 719307303386
  • Brand: Trijicon
  • Model: Advanced Combat Optical Gunsight (ACOG)
  • Magnification: 4x
  • Objective: 32mm
  • Length: 5.8"
  • Weight: 9.9 oz.
  • Bullet Drop Compensator: Yes
  • Illumination Source: Fiber Optics & Tritium
  • Reticle Pattern: Crosshair
  • Reticle Color: Red (Day and Night)
  • Calibration: .223
  • Eye Relief: 1.5"
  • Exit Pupil: 8mm
  • Field of View: 7 Degrees
  • Field of View @ 100 Yards: 36.8'
  • Adjustment @100 Yards: 2 (clicks/inch)
  • Housing Material: Forged Aluminum
  • Features: TA51 Mount Included

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The Trijicon ACOG (Advanced Combat Optical Gunsight) series was designed to be extremely durable and reliable. ACOG sights combine traditional, precise distance marksmanship with CQB speed. Every feature of an ACOG scope was chosen for a single purpose: to provide increased hit potential in all lighting conditions.

The 4x32 ACOG scope features a dual-illuminated red crosshair reticle that uses fiber optics and tritium for a bright aiming point in all light conditions. The ranging reticle also allows for bullet drop compensation out to 600 meters without any manual adjustments. Another important feature of the 4x32 ACOG sight is that it comes equipped with the Trijicon TA51 mount. The TA51 mount is a thumbscrew Picatinny mount manufactured by Trijicon specifically for your ACOG sight. When it comes to optics, you can trust Trijicon and their brilliant aiming solutions.

SKU: 5165458124
SKU 5165458124
Brand Trijicon
Department Knives Optics Flashlights
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165458124

Questions and Answers

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Browse 5 questions Browse 5 questions and 10 answers
Is this set for a 14.5, 16, or 20in barrel?
Brian S on May 3, 2019
BEST ANSWER: This is the TA31-CH model - it does not have ballistic optimization. If this is important to you, then you are probably more interested in either the TA31RCO-A4CP (20" barrel) or the TA31RCO-M150CP (14.5" barrel). Both these RCO models have the chevron with the Target Reference System, whereas this model is a crosshair.
Do you do lay away?
Davey on May 2, 2019
I have heard that people who wear glasses have trouble with out of focus reticles on ACOG's. Any truth to this?
Larry R on May 4, 2019
BEST ANSWER: This optic is probably better if you wear glasses. Especially if you have an astigmatism.
Would this scope work for day time / night time shooting? Looking for a 2 for 1 for the bang of the buck..
DirtyKurt on May 3, 2019
BEST ANSWER: This scope is optimal for daytime and low light conditions. The external fiber allows the reticle to illuminate further when it’s bright (like increasing the brightness on your phone). Generally it’s way too bright and you’ll need to partially cover the fiber. It uses a hydrogen isotope known as tritium to illuminate it when there is little to no light. There is no need for a battery, but because it’s a radioactive isotope and an unstable one, it has a half life. For tritium, that is around 15 years. From what I’m told trijicon will replace the tritium. The optic is also night vision compatible. Like most high quality scopes, this will gather light and allow you to see much clearer in early twilight periods.
Would this work on a 5.45x39 rifle?
Basil on Jul 4, 2019
BEST ANSWER: This would work but the ranging reticle is designed for the 5.56 X 45 mm cartridge. I would not recommend this for a 5.45X39mm rifle.


4.9 / 5.0
14 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
There’s a reason the Marine Corps and Army keep buying these...
This particular optic is a little pricey, but overall worth the money. We put the same optic through hell overseas and had little to no issues. Consistently accurate and sturdy. Semper Fidelis.
February 1, 2020
1 year ago
Absolutely awesome optic for an AR-15
The biggest thing I can say about Trijicon is how amazingly clear the optics are. Absolutely perfect 4x magnification. The tritium illumination can be a little weak in some lighting conditions (my favorite outdoor range has a roof over the shooting stalls), but absolutely great in low-light/dark environments. The fiber optic pickup makes the reticle very bright in sunlight. Factor in the durability of Trijicon ACOG's, and you have a combat proven, fast target acquisition battle optic. A bit pricy, but you truly get what you pay for.
July 29, 2019
11 months ago
Not what I expected, but I like it nevertheless.
I've always wanted an ACOG, so when I saw this on sale I immediately ordered it. Well, I should have read the description and done some research, because this one isn't the model with the ACSS reticle and the chevron, so of course I was a little disappointed. But once I put this on my competition rifle and sighted it in at 100 yds, I couldn't stop smiling. I was using Winchester 55g xm193 and it was almost like I couldn't miss.. had to cover 3/4 of the fiber optic to prevent blooming, but over-all, I have grown to really like this optic.
User submitted image
Added Jul 25, 2019
July 25, 2019
12 months ago
The optic works great, was super easy to sight in and is as rugged as it says in the description.
July 22, 2019
1 year ago
Excellent product! great price
I have been waiting for this optic for some time, when I saw the price that the promotion had listed, I made the move and bought it. Works just like the one I had while enlisted, pleased beyond measure!
July 17, 2019
1 year ago
Trijicon ACOG 4x32
I took my Colt M4 to the range this morning to zero my new ACOG. I'm very pleased with how the ACOG zeroed, and how well I shot with it. I had an Aimpoint M2 on my military M4 in Afghanistan, and have traditionally been "Aimpoint biased" when comparing both sighting systems. I've replaced this bias with a better understanding and appreciation of BOTH systems. I like the precision that the ACOG brings to my shooting, and I'm impressed with how easy and precise the windage & elevation controls are to use. I like this scope, I HAVE recommended it to a friend, and I'll likely purchase another one.
July 7, 2019
1 year ago
Just like what I carried overseas. I dialed it in and it is accurate. I haven’t had a chance for any long ranges yet, but looking forward to it. It was on sale through PSA. Only issue was the case it came in. It was missing a lock for the case. I would have expected a higher quality from Trijicon for the amount of money spent. I’m not actually using the case, but still it was put in the case, no lock. Put in the box, no lock. How many people touched it and it still went out without it. That’s my only reason for 4 stars.
User submitted image
Added Jul 3, 2019
July 3, 2019
1 year ago
Outstanding scope. Excellent price. Got it sighted in and it does everything I want it to do.
July 1, 2019
1 year ago
The Best
What can I say it’s an ACOG. Best Optical sight for AR-15.
June 25, 2019
1 year ago
Can’t be beat
Great price for a trijicon acog. Worked like new. Checked serial and mine dates back to a production date of 2014. I’m assuming that PSA orders a ton of these at once, otherwise j cannot see how they justify such a low price. Optic works great in low light and does not get drowned out by daylight. On a clear sky 90 degree day my optic illuminated bright red. Came with the plastic storage box, a sticker, warranty info and product info.
June 16, 2019
1 year ago

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