Gas block

[NightStalker]

Question is there a difference in the gas block for an AR10 and AR15?

I don’t think there is but want to ask

[98Z5V]

The only difference is in the bore size of the gas block, for the gas block journal size.  There's some weird ones out there now, with custom shiit, but the common ones are 0.625", 0.750", 0.875" (there's a pattern there, 0.125" apart), and then there's the 0.936".

Gas blocks are gas blocks.  Doesn't matter what AR they go onto.  Depends on the barrel maker.

Gas TUBES between large frame and small frame ARs SHOULD be different, because of height-over-bore between the two platforms.  Different bends between the two, because of height-over-bore.

Problem is, alot of barrel makers spec out an AR15 gas tube length for a Large Frame AR...  it's not a huge deal, but it's still a deal, to deal with...

Check this pic - it should be obvious...

[NightStalker]

Good info I’d have gotten the gas tube wrong thanks

[NightStalker]

Where would I find a Ar308 gas tube.  Ow that I’ve seen the one above I can see a difference 

[98Z5V]

29 minutes ago, NightStalker said:

Where would I find a Ar308 gas tube.  Ow that I’ve seen the one above I can see a difference 

Armalite.  The Armalite AR-10 gas tubes are the longer ones, over the standard AR15 gas tubes that most manufacturers use. 

[jim3326]

Fulton Armory carries them also if Armalite is out of stock.

[NightStalker]

Thank you 

[unforgiven]

Just got one https://www.primaryarms.com/armalite-rifle-length-gas-tube-armeu0170

[98Z5V]

13 hours ago, unforgiven said:

Just got one https://www.primaryarms.com/armalite-rifle-length-gas-tube-armeu0170

That's an AR15 (Armalite M15) rifle gas tube, brother.  Same part number on Armalite's website, check it:

https://www.armalite.com/SACItem.aspx?Item=EU0170&ReturnURL=/Armalite/Product-Category/M-15EA-15-Parts-Accessories/Upper-Receiver-Parts&Category=e81c716e-9c82-41b1-a76e-fb6815c75b21

[unforgiven]

9 hours ago, 98Z5V said:

That's an AR15 (Armalite M15) rifle gas tube, brother.  Same part number on Armalite's website, check it:

https://www.armalite.com/SACItem.aspx?Item=EU0170&ReturnURL=/Armalite/Product-Category/M-15EA-15-Parts-Accessories/Upper-Receiver-Parts&Category=e81c716e-9c82-41b1-a76e-fb6815c75b21

I fuked up needed AR10 rifle gas tube

[unforgiven]

Thanks for catching that brother 

[NightStalker]

I found a mid length 12 in gas tube on CDNN for little over just under $7, Hoping this one is good to go

 

https://www.cdnnsports.com/ar-308-gas-tube-midlength-bushmaster.html

Edited May 7, 2022 by NightStalker

[98Z5V]

Bushmaster was DPMS, and that was all AR15 gas tubes. 

[NightStalker]

On 5/7/2022 at 4:53 PM, 98Z5V said:

Bushmaster was DPMS, and that was all AR15 gas tubes. 

It’s a quarter in longer than that of Fultons 308 gas tube. 

[98Z5V]

9 hours ago, NightStalker said:

It’s a quarter in longer than that of Fultons 308 gas tube. 

Do you have it in your hands yet?

[NightStalker]

53 minutes ago, 98Z5V said:

Do you have it in your hands yet?

No sir it’s on the way

[98Z5V]

11 minutes ago, NightStalker said:

No sir it’s on the way

Measure it when it gets there - I'll be curious to what it really measures.  

12" is not an AR15 gas tube length.  It's also not an Armalite AR-10 Carbine gas tube length. 

[NightStalker]

I will, it should be mid length.  
hope I read it right, now ya got me questioning myself lol
 

 

[98Z5V]

1 hour ago, NightStalker said:

I will, it should be mid length.  
hope I read it right, now ya got me questioning myself lol
 

 

Don't question you - question what the "advertisers" sold you.  12" isn't even a gas tube, unless it's a custom one from White Oak Armament, and you ordered it specifically. 

[unforgiven]

Couldn't find a AR10 rifle gas tube from Armalite so I went with Fulton FAR .308 rifle gas tube the site calls it similar to Armalite AR10 rifle gas tube.

[NightStalker]

1 minute ago, unforgiven said:

Couldn't find a AR10 rifle gas tube from Armalite so I went with Fulton FAR .308 rifle gas tube the site calls it similar to Armalite AR10 rifle gas tube.

Have you received it yet? 
I know it’s supposed to be 113/4 but maybe put a tape to it and check the bend to the barrel 

[unforgiven]

Not yet thought it was 11 11/16"

[98Z5V]

9 hours ago, unforgiven said:

Not yet thought it was 11 11/16"

That's AR15 measurements, right there.  Armalite AR-10 Carbine gas tube is 12 1/16" long.

[98Z5V]

11 hours ago, unforgiven said:

Couldn't find a AR10 rifle gas tube from Armalite so I went with Fulton FAR .308 rifle gas tube the site calls it similar to Armalite AR10 rifle gas tube.

AR-10 Rifle gas...

11 hours ago, NightStalker said:

Have you received it yet? 
I know it’s supposed to be 113/4 but maybe put a tape to it and check the bend to the barrel 

That's AR15 Midlength gas.  AR-10 Rifle gas tubes are 15.5" long.  AR15 Rifle gas tubes are 15.25" long. 

Here's what the bend to the barrel difference is, between AR15 and AR-10 gas tubes.  This is "Height Over Bore" difference, right here:

[unforgiven]

10 hours ago, 98Z5V said:

AR-10 Rifle gas...

That's AR15 Midlength gas.  AR-10 Rifle gas tubes are 15.5" long.  AR15 Rifle gas tubes are 15.25" long. 

Here's what the bend to the barrel difference is, between AR15 and AR-10 gas tubes.  This is "Height Over Bore" difference, right here:

Thanks brother I had that all fukedup