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AR gas tube lengths


This is a discussion on AR gas tube lengths within the AR-15 forums, part of the Long Guns category!
Anyone want to school me on how to measure for the length I would need? I thought I had it ...


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Old 08-23-2013, 08:35 PM   #1 (permalink)
 
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Default AR gas tube lengths

Anyone want to school me on how to measure for the length I would need?

I thought I had it figured out and ordered a gas tube a while back. Now I have a supposed mid length tube that's way too long.

Thanks,
Tim
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Old 08-24-2013, 11:03 AM   #2 (permalink)
 
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There are 4 size gas tubes:
- Pistol length = 7.5"
- Carbine length = 9.75"
- Mid length = 11.75"
- Rifle length = 15.125"

To determine which you need, measure from the front of the upper receiver / barrel nut to the beginning of the gas block:
- Pistol length measurement = 3.5" - 4"
- Carbine length measurement = 6.5" - 7"
- Mid length measurement = 8.5" - 9"
- Rifle length measurement = 11.5" - 12

Hope it helps
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Old 08-24-2013, 11:41 AM   #3 (permalink)
 
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Thanks. I'll dig out the tape measure after lunch and see where I screwed up lol
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Old 08-24-2013, 11:59 AM   #4 (permalink)
 
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No problem brother.
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Old 08-24-2013, 12:22 PM   #5 (permalink)
 
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Default Re: AR gas tube lengths

Thanks Brad, good info.

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Old 08-24-2013, 01:39 PM   #6 (permalink)
 
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Originally Posted by SWSS View Post
Thanks Brad, good info.

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No Problem guys. This is Rob, Brads brother. I haven't yet made a formal introduction lol. I'm usually the guy behind the scenes running machinery out in the shop. I dont do well with computers lol
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Old 08-24-2013, 02:11 PM   #7 (permalink)
 
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Got a measurement of 7 1/4" from edge of upper receiver to edge of where the gas block mounts and 7 3/4" from receiver to gas port hole
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Old 08-24-2013, 02:27 PM   #8 (permalink)
 
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Originally Posted by RangerDanger View Post
Got a measurement of 7 1/4" from edge of upper receiver to edge of where the gas block mounts and 7 3/4" from receiver to gas port hole
That will run a carbine length tube. They are the most common.

- Rob
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Old 08-24-2013, 02:40 PM   #9 (permalink)
 
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Thanks for all the help. Gotta order a new tube now
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Old 08-24-2013, 09:26 PM   #10 (permalink)
 
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wellll, welcome anywho!
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