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Posted: 4/2/2017 11:07:37 AM EDT
[#1]
The heavier 308 spring should be softer on the rifle. Kaw valley sells a 308/pistol caliber spring. Same spring used for both
At least that's my understanding. So you should be good. Its still going to be dirty, it's a blowback |
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Posted: 4/2/2017 5:40:34 PM EDT
[#2]
I'm running the KAK 9mm buffer and 308/ 9mm spring.
Runs perfectly. |
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Posted: 4/2/2017 6:17:04 PM EDT
[#3]
Spring tension makes very little difference to bolt opening in a blowback system, despite the commonplace perception that it does.
The main difference is that spring rate determines the energy of closing the bolt, stripping a round from the magazine and chambering it. Excessive energy here does nothing to help you. It takes very little energy to strip a 9mm from the magazine and chamber it, much less than it takes for a 5.56 which has a longer cartridge to strip and chamber and also to lock the bolt. |
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Posted: 4/2/2017 7:14:51 PM EDT
[#4]
Seems like the 9mm bolt slaps into the rear of the 9mm barrel with an awful lot of force especially with the 308 buffer spring. Wouldn't the 223 bolt with locking lugs cushion the impact at the rear of the 223 barrel over the 9mm bolt slamming home.
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Posted: 4/2/2017 10:20:28 PM EDT
[#5]
Quote HistoryQuoted:
Seems like the 9mm bolt slaps into the rear of the 9mm barrel with an awful lot of force especially with the 308 buffer spring. Wouldn't the 223 bolt with locking lugs cushion the impact at the rear of the 223 barrel over the 9mm bolt slamming home. Currently , I use a Tubbs ( variable power ) 308 spring and a KAK 6.5ish oz carbine buffer. |
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Posted: 4/2/2017 11:10:35 PM EDT
[#6]
I use a standard carbine spring and an adjustable weight buffer.....5.5 to 7.5 ounces.....and usually keep it at 7.5. I go to 8 on a full auto with an auto trip and it runs nice.
Couldn't agree more........... Quoted:
Spring tension makes very little difference to bolt opening in a blowback system, despite the commonplace perception that it does. The main difference is that spring rate determines the energy of closing the bolt, stripping a round from the magazine and chambering it. Excessive energy here does nothing to help you. It takes very little energy to strip a 9mm from the magazine and chamber it, much less than it takes for a 5.56 which has a longer cartridge to strip and chamber and also to lock the bolt. |
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Posted: 4/3/2017 10:05:44 AM EDT
[#7]
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 (standard) - 8.3lb closed, 16.3lb open SpringCo (extra) - 10.5lb closed, 18.4lb open SpringCo (increased) - 13.9lb closed, 24.8lb open |
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Posted: 4/3/2017 11:39:53 AM EDT
[#8]
Quote HistoryQuoted:
Spring tension makes very little difference to bolt opening in a blowback system, despite the commonplace perception that it does. The main difference is that spring rate determines the energy of closing the bolt, stripping a round from the magazine and chambering it. Excessive energy here does nothing to help you. It takes very little energy to strip a 9mm from the magazine and chamber it, much less than it takes for a 5.56 which has a longer cartridge to strip and chamber and also to lock the bolt. |
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Posted: 4/20/2017 7:31:33 PM EDT
[#9]
Tried a bunch of things. Tubb flat wire springs, heavy buffers, quarters. Best so far is a JP AR-10 spring with a Blitzkrieg hydraulic buffer. Spendy but SMOOTH.
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Posted: 4/21/2017 8:57:16 AM EDT
[#10]
as commented above, I tried a 9oz buffer and .308 spring in my 16" PCC... got significant bolt to barrel slamming... went back to a 5.2oz rifle buffer and 5.56 rifle spring with a NFA bolt
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Posted: 4/21/2017 7:18:05 PM EDT
[#11]
Use a Carbine buffer spring and a heavy buffer. I like the Kak 10oz buffer.
Stiff springs cause rounds to feed too quickly. |
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Posted: 4/22/2017 12:06:23 AM EDT
[#12]
Quote HistoryQuoted:
Use a Carbine buffer spring and a heavy buffer. I like the Kak 10oz buffer. Stiff springs cause rounds to feed too quickly. |
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Posted: 4/23/2017 12:24:19 PM EDT
[#13]
Quote HistoryQuoted:
Use a Carbine buffer spring and a heavy buffer. I like the Kak 10oz buffer. Stiff springs cause rounds to feed too quickly. |
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Posted: 4/23/2017 12:39:48 PM EDT
[#14]
Quote HistoryQuoted:
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 (standard) - 8.3lb closed, 16.3lb open SpringCo (extra) - 10.5lb closed, 18.4lb open SpringCo (increased) - 13.9lb closed, 24.8lb open |
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