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AR15.COM
5/9/2025 2:29:36 PM EDT
[Last Edit: SemperGumbi][Edited]
Any chance we can get the official current production gas port sizing for the DD barrels from the company rep?

I am specifically interested in the 11.5" and 10.3" stripped barrels but the sizes for the 14.5" and 16" mid gas would be great too. Please and thank you!

@Marler5811
5/13/2025 7:14:04 PM EDT
[#1]
Anyone able to help?
5/16/2025 11:20:13 PM EDT
[Last Edit: urbankaos04][Edited] [#2]
@SemperGumbi

I started a thread about GP sizes awhile back, but somehow I unsubscribed from it and it got archived. It has the info you need.

Gas port sizes.

Colt's gas port sizes are:

10.3"    - .070" (The NSW Crane spec for the 10.3" Mk18 barrels is 0.070")
11.5"    - .070" FBI/HRT SOCOM
11.5"    - .074" Colt 6933/Commando
14.5"    - .062" (carbine gas)
16"      - .062" (carbine gas)
16"       - 0.071 (6960 mid-length)

DD GP sizes:

10.3”  -  .070"
11.5”  -  .069"
14.5    -  .076" (mid-length)
16”     - .073 (mid-length)
Change is the only constant. - Heractilus
5/17/2025 12:00:11 PM EDT
[#3]
Thanks! I was hoping to get verification from DD themselves that those are the current sizes but your numbers do help.
5/28/2025 12:37:38 AM EDT
[#4]
Quote History
Originally Posted By SemperGumbi:
Thanks! I was hoping to get verification from DD themselves that those are the current sizes but your numbers do help.
View Quote


Glad to help out.
Change is the only constant. - Heractilus
6/4/2025 5:17:53 PM EDT
[#5]
Anyone know what the gas port is on the 14.5" Government Mid-gas barrel?
6/4/2025 5:34:48 PM EDT
[#6]
Quote History
Originally Posted By SemperGumbi:
Anyone know what the gas port is on the 14.5" Government Mid-gas barrel?
View Quote


.076
6/4/2025 7:35:14 PM EDT
[#7]
Quote History
Originally Posted By methical20:


.076
View Quote

I wonder how that would work with a high back pressure can like an Otter Creek?

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