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Posted: 5/19/2017 8:50:33 PM EDT
[#1]
Quoted:
Looking to put together a SBR 7.62 x 39 upper with a 7.5" or 8" barrel and was wondering about needing or using an adjustable gas block on it. No need for an adjustable gas block, 7.62x39 doesn't have the gas pressure like like a .223 or 5.56, especially with a short barrel. |
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Posted: 5/20/2017 12:36:11 AM EDT
[#2]
My x39 rifles really benefitted from adj. gas blocks. But I have no experience with a barrel as short as you're intending. That thing's going to be a real dragon.
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Posted: 5/20/2017 2:38:15 AM EDT
[#3]
I have a 7.5" barrel and added an adjustable gas block to turn down the pressure, but still having issues cycling steel cases. Brass cases work fine.
I'm going to try a heavier buffer next to see if that makes a difference. |
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Posted: 5/20/2017 7:37:47 AM EDT
[#4]
If I use a standard GB whats the shortest reliable/recommended barrel length?
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Posted: 5/20/2017 8:18:20 AM EDT
[#5]
Buying a barrel already made or shortening a 16" barrel? I built a 8.5" 7.62x39 years ago, needed to really open the gas port. Could never get it to run 100% with a piston on it. Ran OK as a gas gun, but the gas port was huge compared to a 5.56 barrel.
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Posted: 5/20/2017 9:34:05 AM EDT
[#6]
I have the PWS Diablo, which has a 7.5 inch barrel. It does have an adjustable gas block. I think 4 position. Works great. Semi or full auto, works.
This upper suppresses very well. I'd get a adjustable gas block just to run it with a suppressor. Before you ask, the Saker 762 is rated for that barrel length in full auto. I asked SilencerCo before I did it, and I have it in writing. |
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Posted: 5/20/2017 2:26:21 PM EDT
[#7]
Quote HistoryQuoted:
My x39 rifles really benefitted from adj. gas blocks. But I have no experience with a barrel as short as you're intending. That thing's going to be a real dragon. Mine did too.. Seems like everyone drills to .093" (except 7.5" barrels) Faxon mid length 16" ARD carbine 16" Radical Firearms carbine 10.5" and 16" All drilled to .093". Definitely get an adjustable gas block. In the 5.56 world, most people know around what gas port diameter works and is not over gassed. |
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Posted: 5/20/2017 4:13:01 PM EDT
[#8]
I had a PWS Diablo and sold it now I miss it and was thinking I would build my own this time. I have read the 7.5" barrels are not that reliable and was thinking I would go to 8-8.5" maybe even 10.5" but would like to keep it as short as possible.
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