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Does this DD 10.3 barrel have the .070 gas port diameter size? — 4 Answers

by Frank, from CA, United States Asked on December 20, 2018

Name Daniel Defense Assy 5.56mm NATO Threaded Barrel (4.7)
As Low As $348.00 Save Up to $31.00
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Answered by Ethan C., Gear Expert, from IL, United States, on May 23, 2019

The 10.3" barrel has a .750 gas block journal.

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A
Answered by David, guest, from MD, United States, on July 25, 2019

After mid-2017, DD switched over to a smaller gas port size on their Mk18 (10.3") barrels. They even changed the barrel, gas block, and BCG on my 2013 factory Mk18 SBR, free-of-charge. Since OpticsPlanet is a secondary vendor, I can't vouch for the ones they have in stock - I would measure using a pin gauge before installing. Beyond that, DD is solid.

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Answered by Youmadbruh, member, from OR, United States, on December 30, 2022

The so called experts arent even answering the actual question. The question is the gas PORT diameter not the journal diameter. Port size should be .069"

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Answered by mune, member, from NE, United States, on September 01, 2025

Yes, since around 2017, daniel defense 10.3" barrel gas port uses the .070" hole diameter.

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Last updated 2026-06-01 UTC.