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Old September 8, 2017, 12:56 PM   #1
Chainsaw.
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Ar10 buffer spring size?

Is it the same size as an AR15 buffer spring?
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Old September 8, 2017, 04:00 PM   #2
navajo
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No.
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Old September 8, 2017, 04:00 PM   #3
bfoosh006
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There are a LOT of variables with .308 buffer springs... The actual OAL length of a typical recoil spring matters ...

A Tubbs Flatwire .308 spring can be used just about with everything.

We will need to know your buffer tube "type / brand " and OAL .

Since the BCG on a "AR10" is longer then a AR15 BCG... its tail extends further into the buffer tube.

What rifle ... etc ?

I have a long thread about the PSA PA10 GenII going on... that is why I am asking.
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Old September 11, 2017, 01:52 PM   #4
Chainsaw.
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I have an AR in 9mm Im trying to "tune" Ive heard from a couple of people "put a 308 buffer spring in it", beyond that they couldn't give me any specifics. The idea being it would settel the recoil down a little bit being the 9s are staright blowback. Id like it to shoot just a little more soft than it does now to speed follow up shots.

Its a KAK pistol tube with a 5.4 buffer.

I figure for $20 its worth a shot.
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Old September 11, 2017, 05:31 PM   #5
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Like many things in the AR 10--there is no real standard--so there really isn't a a standard for buffer assemblies either. you could have something as short (both buffer and spring) as something like a LR 308 carbine set-up for a magpul PRS (DPMS and PSA make sets for this type of set-up) all the way out to a 9" fixed stock type set-up. The length of the buffer has to be long enough so that it bottoms out before allowing the carrier to impact the buffer tube collar ears.
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Old September 11, 2017, 07:34 PM   #6
navajo
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Only interchangeable buffer springs I know of are Armalite. Spring for rifle and carbine are the same.
May be more that I dont know about.
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Old September 13, 2017, 03:41 PM   #7
bfoosh006
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Is a pistol tube the same length as a Carbine tube ???

If it isn't, the Tubbs flatwires still are shorter then normal when fully compressed...

Watch this video... You will see how much shorter it is compressed...

https://www.youtube.com/watch?v=8fMVZbrnvu8



Here are some spring weight measurements from David Tubbs... just food for thought.

A2 (old) - 7.6lb closed, 14.5lb open
A2 (new) - 9.1lb closed, 16.7lb open
Tubb Flatwire - 10.5lb closed, 16.3lb open
Tubb .308 Flatwire - 13lb closed, 16.7lb open
SpringCo White ? (standard) - 8.3lb closed, 16.3lb open
SpringCo Red (extra) - 10.5lb closed, 18.4lb open
SpringCo Orange (increased) - 13.9lb closed, 24.8lb open


IMHO, an extra power SpringCo spring isn't needed , nor wanted.

I tried both the "Red" and "Orange" ... both caused needless muzzle dip, and were slamming the BCG really hard into the breach face


You can see the Tubbs .308 flatwire has the added spring weight where you want it....with the BCG closed.

My PCC isn't a pistol buffer tube... it is a carbine length....but...

I run ( and love ) a KAK Configurable Extended 9MM buffer ( about 7.5oz ) and the Tubbs .308 Flatwire... it now shoots very softly.

Last edited by bfoosh006; September 13, 2017 at 04:23 PM.
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Old September 14, 2017, 03:13 PM   #8
Chainsaw.
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Boofish, thanks for the info. A heavy buffer isnt out of the questiom for me, but definitely wanted to try the cheaper and easier (no bugfer tuning) first. Ill get one come in short order.
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