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Is this scope design for a 16” barrel on an Ar15, 556, 223 — 5 Answers

by Leo, from CA, United States Asked on April 2, 2018

Name Trijicon TA31RCO-M4 ACOG 4x32 USMC M4 Rifle Scope w/ TA51 Mount & (5)
$1,857.00 $1,439.00 Save 23%
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Answered by jaltrx, guest, from TX, United States, on April 07, 2018

Yes. This is the same optic I used in the USMC and it's meant for 5.56mm(.223). It doesn't matter if you have a 20 inch barrel or a 14.5" or a 16". Dial it in and you're good to go.

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Answered by 11, member, from TX, United States, on June 06, 2019

14.5 inch barrel and 20 inch barrel models are NOT the same unless shooting from 7 yards. I'm sure a 16" barrel will do good with the 14.5 model but not the 20 inch

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Answered by Jay, guest, from PA, United States, on November 21, 2022

This reticle is calibrated for a 62gr m855 shot from a 14.5” barrel

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Answered by P M, member, from NJ, United States, on February 12, 2019

16” barrel. That’s why it has M4 in the model number. The 20” M16 takes a different Acog model.

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Answered by QuickDraw Mcgraw, member, from NV, United States, on July 14, 2023

No it’s calibrated for a 14.5 barrel using 62 grain. You can use it for your 16 barrel but just know that you will have some holdovers that you need to memorize at certain distances.

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