User Panel
User Panel
User Panel
IL, USA
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Posted: 9/16/2018 9:36:29 AM EDT
I have a PSA AR10 .308. I took the barrel off last night to square off the receiver face, and I noticed that the gastube is in contact with the barrel nut. It is just a very small section that touches. Will this affect accuracy at all?
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Posted: 9/16/2018 12:06:44 PM EDT
[#1]
You took off the barrel, and when you put the barrel nut back on it is touching?
Did you mean to say you took off the handguards? Pictures would be nice but depending on how much force is being exerted on the tube it could be deflecting enough to contact the BCG when cycling. |
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KS, USA
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Posted: 9/16/2018 3:55:05 PM EDT
[#2]
No touching is best. Lots of issues can result from contact.
You can bend the tube to achieve best alignment. |
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Posted: 9/17/2018 5:10:08 PM EDT
[#3]
Biggest issue is clipping with bias to one side of the gas tube flange that inserts into the carrier key.
As the rifle cycles normally, the flange will wear down on one side, which will allow more gas to escape into the upper vs pressuring up the internal expansion chamber in the BCG. Eventually, the rifle will short-stroke, and you'll see a lot of carbon residue inside the receiver. |
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Posted: 9/20/2018 6:18:36 PM EDT
[Last Edit: bfoosh06]
[#4]
double tapped.
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Posted: 9/20/2018 6:20:01 PM EDT
[#5]
Like LRRPF52 said... uneven wear...
And IMHO, it will not help accuracy. How much who knows for sure... it could cause those pesky fliers. But any inconsistent "back into battery" will cause everything to be.. well, inconsistent. And inhibits the firearm to achieve all the accuracy it can. As also mentioned, you can bend the tube to allow free movement into the gas key.... trial and error is best, slow and steady... they can kink easily. Some photos would be very helpful... my first PSA's also had the gas tube being forced upward.. clear from the front of the barrel nut, to the end. Not to mention I would , personally like to see the type of barrel nut... there have been numerous versions. And if it is a readily replaceable one... Because I don't mind tinkering, I ground my PSA OEM barrel nut flatter where it made contact... again, all the way from fore to aft was needed for mine. |
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Posted: 9/22/2018 9:33:51 AM EDT
[#6]
Just re-stumbled across this... it discribes it far better then I can...
8. Gas Tube Routing Clearance: You want a gas tube that runs freely through the barrel nut, through the front of the upper receiver, and through the gas key in the carrier. Ensure the gas tube is not impinged by any of them, so that it does not load the carrier in a stressed orientation. You don’t want the gas tube bound up so that when the gas tube pressures up it immediately wants to transmit more force and impulse to the barrel than would normally occur. We sometimes spend a lot of time moving the gas block with gas tube on and off new build uppers and tweaking gas tubes to get proper clearance and alignment. Most gas tubes do need a little “tweaking” to get them right — factory tubes may work OK but they typically do not function optimally without hand-fitting. From here... http://bulletin.accurateshooter.com/2015/05/what-makes-an-ar-accurate-whitley-offers-answers/ |
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