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Posted: 4/20/2024 5:56:16 PM EDT
[Last Edit: hhsmiley]
I watched a video the other day and the guy in the video was saying that the gas tube should come back to the point where it ends right in the middle of the cam pin cutout in the upper.
I bought a Faxon barrel and their rifle length gas tube thinking that would ensure that everything will line up right. The gas tube only comes back to a point about 1/3 of the way back in the cam pin cutout. It seems there is no "standard" for how long the gas tube should be for AR-10 rifles according to this dude. Mine is about 15.1875" long. Is this actually an issue? If so, who makes a gas tube that's just a little longer? Thanks.  Attached File |
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Posted: 4/20/2024 6:08:20 PM EDT
[Last Edit: hhsmiley]
[#1]
Well I answered one of my own questions. I found this:
https://truenortharms.com/ar15_default_store_view/gas-tubes-for-ar-15-ar-10-stainless-1.html I think it being .200 longer would put it right in the middle of the cam pin cutout. The question remains though, do I even need to worry about it? |
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Posted: 4/20/2024 6:44:11 PM EDT
[#2]
It will probably cycle like that, but a gas tube is so easy to swap, it makes little sense not to have the correct size. Armalite, Fulton Armory, Wilson Combat, and a few others sell the longer length tube.
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CA, USA
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Posted: 4/20/2024 7:04:10 PM EDT
[#3]
You have an AR15 rifle length gas tube. The Faxon barrels I've used required the Armalite AR10 rifle length gas tube which is about 3/8" longer. They are getting harder to find anymore. Fulton Armory sells one the length you need.
Using the shorter gas tube may or may not cause some cycling issues. You won't know for sure until you shoot it. |
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CA, USA
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Posted: 4/20/2024 7:09:20 PM EDT
[#4]
Quote HistoryOriginally Posted By lew: It will probably cycle like that, but a gas tube is so easy to swap, it makes little sense not to have the correct size. Armalite, Fulton Armory, Wilson Combat, and a few others sell the longer length tube. |
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Posted: 4/20/2024 7:22:29 PM EDT
[#5]
Quote HistoryOriginally Posted By lew: It will probably cycle like that, but a gas tube is so easy to swap, it makes little sense not to have the correct size. Armalite, Fulton Armory, Wilson Combat, and a few others sell the longer length tube. Anderson sells it also. |
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Posted: 4/20/2024 8:21:22 PM EDT
[#6]
OK, good to know there are multiple sources for the ~15.5" tubes. If the longer tubes will work, I'd rather go that route than have to pay twice as much for the 15.375" True North tube.
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Posted: 4/21/2024 2:27:47 AM EDT
[#7]
FWIW, all my LFAR's have a gas tube length like your pic ( DPMS pattern )... they all work fine, as a matter of fact, all also use Adj. GB's.
Multiple calibers and barrel lengths with mid, rifle and +2 gas system lengths. All sorts of ammo. |
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AZ, USA
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Posted: 4/21/2024 1:46:44 PM EDT
[#8]
Faxon barrels in particular need the longer gas tube.
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TX, USA
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Posted: 4/22/2024 7:19:14 AM EDT
[Last Edit: DevL]
[#9]
Quote HistoryOriginally Posted By lwbyo1: I never checked Wilson Combat for the AR10 length gas tubes. Good to know they have them. Problem with Wilson is that they place their barrel gas tube length halfway between AR15 and AR10 specs. This is supposed to make them work well with either length but in reality makes them under gassed with AR15 length and the AR10 length tubw sticks in the gas key due to excess length. My advice? When you find a gas tube that works for your barrel... buy a second as a spare. |
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Posted: 4/22/2024 7:31:09 AM EDT
[#10]
I have that issue with my last AR 308 build. Functions fine with everything from old 70s surplus ball to FGMM. I thought when I first assembled it, it would be temporary and I’d get a correct length gas tube to replace. Still haven’t because it works. I think Faxon has something on their website about it and how/why it shouldn’t make any difference.
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Posted: 4/22/2024 7:40:51 AM EDT
[Last Edit: RDTCU]
[#11]
As soon as the carrier travels ~1/4" the gas is venting from the carrier and the bolt is at full stroke.
As long as the gas tube is still in the gas key until that point it will make almost zero difference. |
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OH, USA
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Posted: 4/22/2024 2:22:55 PM EDT
[#12]
I was in a similar boat. I have a Faxon mid-length 16" barrel on my Aero M5 308. Was coming up short like you were with mid-length gas tubes. I had to get an Armalite "Carbine" length AR10 gas tube. my ejection definitely improved after the swap.
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Posted: 4/22/2024 2:34:17 PM EDT
[#13]
Quote HistoryOriginally Posted By RDTCU: As soon as the carrier travels ~1/4" the gas is venting from the carrier and the bolt is at full stroke. As long as the gas tube is still in the gas key until that point it will make almost zero difference. Theoretically, I agree. However, putting the 15.5" tube in after I swapped in a Faxon barrel cleared up ejection issues I was having when the shorter tube was in. Same thing on my brother's build. No changes to either other than the gas tubes. |
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CA, USA
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Posted: 4/22/2024 5:37:26 PM EDT
[#14]
Quote HistoryOriginally Posted By DevL: Problem with Wilson is that they place their barrel gas tube length halfway between AR15 and AR10 specs. This is supposed to make them work well with either length but in reality makes them under gassed with AR15 length and the AR10 length tubw sticks in the gas key due to excess length. My advice? When you find a gas tube that works for your barrel... buy a second as a spare. Quote HistoryOriginally Posted By DevL: Originally Posted By lwbyo1: I never checked Wilson Combat for the AR10 length gas tubes. Good to know they have them. Problem with Wilson is that they place their barrel gas tube length halfway between AR15 and AR10 specs. This is supposed to make them work well with either length but in reality makes them under gassed with AR15 length and the AR10 length tubw sticks in the gas key due to excess length. My advice? When you find a gas tube that works for your barrel... buy a second as a spare. I looked on their site before posting and they do list a specific, 15.50" length, AR10 gas tube for sale. https://wilsoncombat.com/gas-tube-rifle-length-ar-10.html |
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TX, USA
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Posted: 4/29/2024 8:09:47 AM EDT
[Last Edit: DevL]
[#15]
Quote HistoryOriginally Posted By lwbyo1: I looked on their site before posting and they do list a specific, 15.50" length, AR10 gas tube for sale. https://wilsoncombat.com/gas-tube-rifle-length-ar-10.html Yes, the gas TUBE is the correct length. Their barrels use a gas PORT distance that is in between AR15 and AR10. With my Wilson Combat barrel, the AR15 length Wilson gas tube won't function without a suppressor, but the AR10 length gas tube is so long it jams into the interior of my carrier gas key and sticks, causing about a 40% failure rate. If the gas tube was about 1-2 mm shorter, I would not have a problem. If you find the gas tube you buy works, buy a second, just in case. |
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Posted: 4/29/2024 9:24:13 AM EDT
[Last Edit: WrenchGuy]
[#16]
I built mine on an Awro M5 frame with an Aero bolt and Criterion rifle length gas barrel.
I used the Aero rifle length gas tube which is the same part for either an AR15 or an AR10. I guess it would depend on what frame, bolt, and barrel are used to determine the proper gas tube length. As far as I understood it, the DPMS high platform used standard gas tubes, no in-between sizes…at least for the standard gas port placements. |
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