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Q&A for Trijicon TA31RCO-A4CP ACOG 4x32 USMC Rifle Combat Optical Sight for A4 w/ TA51 Mount — 22 Questions & 17 Answers

Name Trijicon TA31RCO-A4CP ACOG 4x32 USMC Rifle Combat Optical Sight for A4 w/ TA51 Mount (4.8)
$1,857.00 $1,439.00 Save 23%
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Q
Dan, guest, from MD, United States, asked on January 10, 2023

I've seen this model listed as 1/3 MOA adjustments online. Is it 1/4 or 1/3?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on March 30, 2023

This Trijicon TA31RCO-A4CP ACOG 4x32 USMC Rifle Combat Optical Sight features 2 clicks of adjustment per inch at 100 yards.

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Q
Monkey, member, from WA, United States, asked on October 12, 2017

How accurate is this scope with a full length barrel? An A2/AR-15A3 versus an M4gery?

Expert Answer
A
Answered by Carly R., Gear Expert, from IL, United States, on October 13, 2017

Accuracy of the optic is not affected by barrel length. However, the bullet-drop markings may be off slightly with shorter barrel lengths as they are designed for the USMC standard M16A4 rifle which has a 20" barrel, using the standard military ammunition load. There are a number of ballistic calculators available that can help re-calculate those markings for a shorter barrel or different ammunition load.

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Q
duckbum, member, from CA, United States, asked on November 23, 2022

I’m thinking of putting this on a 458 socom with 16 inch barrel what do you think

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on December 06, 2022

The Trijicon TA31RCO-A4CP ACOG 4x32 USMC Rifle Combat Optical Sight will work on a 458 SOCOM. However, reticle holdover marks will not be as accurate for that cartridge.

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Q
Joe Dirt, guest, from OR, United States, asked on August 14, 2021

How far off would reticle be using black hills mk 262 77 gr .556?

Expert Answer
A
Answered by Jeremy, Gear Expert, from IL, United States, on November 17, 2021

Your groups will be noticeably higher than shooting with M855 which the RCO is calibrated for.

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Q
Jeffery Poland, member, from TX, United States, asked on June 28, 2021

Which trijicon acog did the military use for the 16” barrel M4

Expert Answer
A
Answered by Patrick, Gear Expert, from IL, United States, on October 13, 2021

That model can be found here:

https://www.opticsplanet.com/trijicon-acog-4x32-illuminated-crosshair-red-dot-weapon-scope-w-b.html?_iv_parent-minimum-magnification=4-x&_iv_availability=in-stock&_iv_code=TJ-RS-TA02RS-TA31F-DEMO

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Q
Greg, guest, from IL, United States, asked on January 17, 2021

Will this work ok for my Wilson Combat AR with a 16" barrel? Just less accurate I would assume......

Expert Answer
A
Answered by Bethany Kopel, Gear Expert, from UT, United States, on January 26, 2021

The bullet-drop markings may be off slightly with shorter barrel lengths as they are designed for the USMC standard M16A4 rifle which has a 20" barrel, using the standard military ammunition load. There are a number of ballistic calculators available that can help re-calculate those markings for a shorter barrel or different ammunition load.

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Q
Nicholas, guest, from NJ, United States, asked on July 21, 2020

Is this rated for .308 ?

Expert Answer
A
Answered by Bethany Kopel, Gear Expert, from UT, United States, on January 26, 2021

It is not suggested to work well with .308, please reach out to us at techsales@opticsplanet.com and we can provide a recommendation.

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Q
wasted, guest, from MN, United States, asked on June 02, 2020

Does this come with the full Trijicon packaging: plastic case, molly case, scopecoat, flashkill & lenspen?

Expert Answer
A
Answered by Bethany Kopel, Gear Expert, from UT, United States, on January 26, 2021

Trijicon states it includes:

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

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Q
Lakes, guest, from CA, United States, asked on May 22, 2020

Can I use 5.56 ammo with this optic.... just because it says 223

Expert Answer
A
Answered by Bethany Kopel, Gear Expert, from UT, United States, on January 26, 2021

Yes, it will work with 5.56 ammo.

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Q
nick, member, from AL, United States, asked on March 29, 2020

Does this come with scope caps?

Expert Answer
A
Answered by Bethany Kopel, Gear Expert, from UT, United States, on January 26, 2021

No, it does not include scope caps. Please reach out to us at techsales@opticsplanet.com and we can provide recommendations.

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