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7/8/2022 10:59:17 AM EDT
This is mostly a personal preference thing but I thought I would get some input from the great and the wise.
I started this build to reduce the weight of my suppressed carbine auto setup but I can't help thinking I may be better off going with a 13.9"barrel  (as opposed to the 12.5" i had planned) so I can have a mid length gas system.
Considering all the tinkering I have done over the years to slow down my auto carbine, and the other benefits of mid gas I am really tempted. The thing that holds me back putting a suppressor out there another 1.4". My current 12.5 is already plenty heavy with a suppressor all the way out there.
7/8/2022 11:51:35 AM EDT
[#1]
There are 12.5 barrels with mid length gas systems FYI. I think the Sage Dynamics/Rosco new K9 barrel is.
7/8/2022 11:54:02 AM EDT
[#2]
What’s the purpose of the build? Just to be light weight? If you want light do a A1/A2 upper with 11.5 carbine barrel.

I say pick the configuration you like and tweak from there.
7/8/2022 12:14:53 PM EDT
[#3]
Quote History
Originally Posted By bluedog82:
There are 12.5 barrels with mid length gas systems FYI. I think the Sage Dynamics/Rosco new K9 barrel is.
View Quote


I checked out their web site. New to me but a very interesting option. I may well buy one. Thank you for the info.
7/8/2022 12:28:55 PM EDT
[Last Edit: amphibian][Edited] [#4]
I definitely can feel the smoothness comparing the same configuration in mid vs carbine...so a mid 12.5 vs a carbine 12.5.
My favorite setup with a Brevis Ultra II w/ a mid gas.





7/8/2022 2:54:35 PM EDT
[#5]
Quote History
Originally Posted By amphibian:
I definitely can feel the smoothness comparing the same configuration in mid vs carbine...so a mid 12.5 vs a carbine 12.5.
My favorite setup with a Brevis Ultra II w/ a mid gas.
https://c3junkie.com/wp-content/uploads/2020/04/12_5Mid-2-1024x463.jpg

https://c3junkie.com/wp-content/uploads/2020/04/BrevisDeltaPUltra2-576x1024.jpg

https://c3junkie.com/wp-content/uploads/2020/12/12-5Mid_556Tubb_A5-Brevis-SurefireOBC-RB5005-Spacer-M855-1024x558.jpg
View Quote


What barrel did you use? the 12.5 Rosco mentioned above?
7/8/2022 3:23:39 PM EDT
[#6]
Quote History
Originally Posted By Eukatae:

What barrel did you use? the 12.5 Rosco mentioned above?
View Quote
I am the inventor of the MicroMOA gas block and back when I was in business, my partner made barrels for my company as well as other manufacturers including Triarc using Fedderson blanks (hybrid polygonal).  That is what is in there now.
7/9/2022 7:00:04 PM EDT
[#7]
BRT CHF CL 12.5 has an extended gas system, longer than carbine, shorter than mid length. And it’s veeeeery smooth shooting.
7/9/2022 7:11:11 PM EDT
[#8]
Advise from a woman, so take that for what its worth.... if longer is an option, never settle for shorter.
7/11/2022 10:38:57 AM EDT
[#9]
Thanks to the excellent assistance provided by you gents I bought a 12.5" with a proprietary midish gas system.
I'll post here with details when it's finished and running.
7/11/2022 3:09:45 PM EDT
[#10]
Mid is definitely what I would pick over carbine for a softer recoil.

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