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9/23/2025 4:09:26 PM EDT
[Last Edit: ArizonaAR][Edited]
What is the recommended starting point for an 11.5 w/ .070 gas port carbine gas barrel? It is not suppressed and won't be anytime soon. TIA
9/23/2025 4:35:45 PM EDT
[#1]
Super42 with H3.
9/23/2025 7:59:37 PM EDT
[#2]
Quote History
Originally Posted By BULLDAWG_556:
Super42 with H3.
View Quote
This or an H2 would work.
I run H2's in all mine.
9/24/2025 11:01:05 AM EDT
[#3]
Ok thanks. I was in the ball park with H2 or H3 with a flat wire carbine spring.
9/24/2025 1:54:20 PM EDT
[#4]
I've run Super 42 spring & H2 as well as the Super 42 spring with a carbine buffer with success (Suppressed)
9/26/2025 7:42:32 PM EDT
[#5]
My go-to setup is typically a Sprinco Blue and H2. My 11.5" is a Colt FBI/HRT, which is a little gassier, so I run an H3
9/26/2025 7:46:24 PM EDT
[#6]
Quote History
Originally Posted By BULLDAWG_556:
Super42 with H3.
View Quote


Same here
9/27/2025 4:54:55 PM EDT
[#7]
JP Enterprise centerless ground and polished with an H2
10/15/2025 6:50:36 AM EDT
[#8]
Originally Posted By Nobody69s:
This or an H2 would work.
I run H2's in all mine.
View Quote


G spring with h2 here.  Running it with a pws mk111 and no issues suppressed or not.
10/15/2025 7:12:49 AM EDT
[#9]
Spike's VPRS looks interesting:

https://www.spikestactical.com/collections/lower-parts/flatline-kit/
10/15/2025 7:24:29 AM EDT
[#10]
H3 and Sprinco Blue
10/15/2025 10:30:36 AM EDT
[#11]
Quote History
Originally Posted By gtsteve03:
Spike's VPRS looks interesting:

https://www.spikestactical.com/collections/lower-parts/flatline-kit/
View Quote

I have to agree. Have to wait and see on some reviews.
10/15/2025 1:13:44 PM EDT
[#12]
I wouldn't go down a rabbit hole on springs. A standard H2 with something like a springco white hot spring will do nicely. You don't want a spring so heavy that it either masks an over gassed situation or causes a properly gassed situation to short stroke.
10/18/2025 10:41:19 AM EDT
[#13]
Standard and standard in mine with zero problems.
10/18/2025 11:05:22 AM EDT
[#14]
Is an A5 buffer tube a possibility?

G$ Rifle spring and an a5h1 buffer will make you happy with the A5 tube
“All things are said already, but since no one is listening, it is always necessary to start again.”
10/18/2025 12:25:06 PM EDT
[#15]
H2 with a standard carbine spring.
Keep it simple.

Jay
The Right tends not to riot. They mostly have three speeds:
Uninvolved, Peaceful but passionate protesting, or Genocide
10/25/2025 6:16:40 PM EDT
[#16]
Quote History
Originally Posted By AZCOP:
H2 with a standard carbine spring.
Keep it simple.

Jay
View Quote


Same here.  Runs 100%, with everything.
10/27/2025 7:10:49 AM EDT
[#17]
Quote History
Originally Posted By Nobody69s:
This or an H2 would work.
I run H2's in all mine.
View Quote


H2 with G spring for me.  Runs great suppressed or unsupressed.
10/27/2025 7:30:55 AM EDT
[#18]
Mine ran fine with a carbine spring and buffer.
When I installed a FRT I put in the H3 buffer and left the carbine spring.

It still runs like a top.
10/27/2025 10:18:15 AM EDT
[#19]
Ain't no trick to it. What buffer tube? For a standard carbine length, I prefer OEM springs and an H3 buffer with an M16-style bolt for max weight.
10/29/2025 10:40:52 AM EDT
[#20]
I had a Tubbs carbine flatwire in the parts bin and tried both H2 & H3 buffers and either worked fine. Thanks everyone for the comments.
10/30/2025 8:16:18 AM EDT
[Last Edit: diescheize11][Edited] [#21]
Originally Posted By Kobolowsky_Tires:
Ain't no trick to it. What buffer tube? For a standard carbine length, I prefer OEM springs and an H3 buffer with an M16-style bolt for max weight.
View Quote




I just picked up a police trade in RRA(upper) chrome lined 10.5 very heavy chonky barrel. I feel pretty proud of it lmao! It came with an ar15 cut bcg for some reason, and to you point i never thought of that... I was hoping to test it out this weekend but I only have access to an H marked carbine buffer... I'll definitely have to pick up an h2 or h3 depending here....
10/30/2025 9:29:44 AM EDT
[#22]
I have a Geissele 42 spring with an H2 buffer in mine.  Works great.

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