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Emperor of the Internet!
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Posted: 7/16/2013 10:11:35 PM EST
[Last Edit: 7/17/2013 9:34:55 PM EST by misc]
I have an AR15 with a 20" rifle length barrel that will be shot suppressed but it doesn't have an adjustable gas block. Is the adjustable gas block a must? If so what is recommended?
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Link Posted: 7/16/2013 10:33:14 PM EST
[Last Edit: 7/31/2013 9:35:47 PM EST by Combat_Jack]
There are two kinds of adjustable gas blocks--quick adjust versions that can be toggled by hand and ones that adjust with tools. Of the first class the Noveske Switchblock is considered the best, of the second I like the Seekins adjustable gas block. You can buy the Seekins gas block at Rainier Arms. Switchblocks are mostly something that comes on factory barrels.
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Link Posted: 7/17/2013 4:44:37 AM EST
What are some of the reasons that would lead me to add one?

I'm considering building my first 'potentially' suppressed rifle and I'd like to know some details as well.

Thanks!

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Link Posted: 7/17/2013 7:22:13 AM EST
Originally Posted By LokiTN:
What are some of the reasons that would lead me to add one?


Weapon function. If you have an overgassed AR in ANY length/gas system, a silencer will make matters worse.

You'll just have to try the set up first and see if it's problematic.

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Link Posted: 7/17/2013 8:16:57 AM EST
tough to do with a pinned FH.

would you recommend going with an adjustable from the start? Any reliability issues?

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Link Posted: 7/17/2013 8:25:54 AM EST
I run a JP adjustable gas block on my 11.5 sbr. It looks like a standard front sight post. After toying with the screw and adjusting it, I get no reliability issues and way less gas in the face. I like em.

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Link Posted: 7/17/2013 8:28:41 AM EST
I have a full length colt rifle and its not very gassy suppressed. You'll know if its overgassed, the gas will be in your eyes out of the charging handle. This happens almost always a little with a suppressor.

I have a noveske switchblock on a carbine, which is one way of dealing with the problem.

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Link Posted: 7/17/2013 5:43:47 PM EST
[Last Edit: 7/17/2013 5:46:45 PM EST by m6z]
Will Noveske sell the pin on switchblocks by themselves? Doing a rifle length gas build and I'd like to run a switchblock, but I'd rather not use the clamp on version.

What are the other toggle options? The only ones I know of are the switchblock and the one Larue has, but they don't sell it separately.

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Link Posted: 7/17/2013 8:49:06 PM EST
Check out MicroMOA, that's the one I'm considering once my stamp comes back.

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Link Posted: 7/18/2013 2:28:02 AM EST
[Last Edit: 7/18/2013 5:05:51 PM EST by dpmmn]
<Edited, you are going to have to register as a Dealer or Industry Partner to advertise here ......................dpmmn>


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Link Posted: 7/18/2013 3:48:43 AM EST
Very interested in the micro MOA. Do you know the port sizes I would need for an 18" barrel with rifle length gas tube or where I could find out what I need?

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Link Posted: 7/18/2013 5:06:15 AM EST
[Last Edit: 7/18/2013 5:06:31 PM EST by dpmmn]
<Edited, you are going to have to register as a Dealer or Industry Partner to advertise here ......................dpmmn>



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Link Posted: 7/18/2013 6:10:09 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By amphibian:
Below is a picture of a customer's 18" SS Stag barrel using a rifle length gas system. Port was way too big. .111"
View Quote


My GOD!

Whomever ported that barrel should be slapped upside the head. I've never heard of ANY AR that needed that much gas. Even a 16" barrel with Rifle length gas doesn't call for that big a hole.

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Link Posted: 7/18/2013 6:36:23 AM EST
[Last Edit: 7/18/2013 5:06:49 PM EST by dpmmn]
<Edited, you are going to have to register as a Dealer or Industry Partner to advertise here ......................dpmmn>


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Link Posted: 7/18/2013 7:33:45 AM EST
That block sounds interesting.
Will the 3 position fit under NSR handguards?

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Link Posted: 7/18/2013 9:24:44 AM EST
[Last Edit: 7/18/2013 9:26:56 AM EST by amphibian]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By vilya:
That block sounds interesting.
Will the 3 position fit under NSR handguards?
View Quote


I know the two position does but not sure of the 3 position. Need a minimum ID of 1.365 for the 3 position.

Someone posted on another forum, regarding the inner diameter of the NSR: "1 3/8" at the smallest cross section (straight across), 1 1/2" at the diagonals."

If that is true, I would say yes, the 3 position should work.

Below is pic of Legion's gun at the 2013 Shot Show w/ the Govnah (2 position) under an NSR.
The NSR isn't round and kinda 'bows' out where regulator plate is so I'm pretty sure it will be fine w/ the 3 position.




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Link Posted: 7/18/2013 10:07:09 AM EST
[Last Edit: 7/18/2013 10:09:43 AM EST by Dog1]
Hansan: "This is a .30 caliber, gas operated, clip fed, semi-automatic rifle....."
Soldier: "Look, you ain't sellin it to me, you're only showing me how it works."
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Link Posted: 7/18/2013 11:28:39 AM EST
M16A2 port, .093.
Mk12 port, .104.

I had a 17" rifle ported .093". It ran well but got sluggish with .223. With a short can it cycled like it would at 20".
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Link Posted: 7/18/2013 3:26:57 PM EST
[Last Edit: 7/18/2013 3:31:45 PM EST by trek45]
I'd also check out the SLR DA7 adjustable gas block:
http://www.ar15.com/forums/t_3_124/610963_SLR_Rifleworks_DA7_Detent_Adjustable_Gas_Block.html

It's $100, stupid simple, and has a wide range of adjustments using a simple allen wrench you can store in the pistol grip:
Quick DA7 Operation Video

ETA: SLR Rifleworks is also a site sponsor.

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Link Posted: 7/19/2013 5:11:57 AM EST
[Last Edit: 7/19/2013 5:14:03 AM EST by BLSTexas]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By trek45:
I'd also check out the SLR DA7 adjustable gas block:
http://www.ar15.com/forums/t_3_124/610963_SLR_Rifleworks_DA7_Detent_Adjustable_Gas_Block.html

It's $100, stupid simple, and has a wide range of adjustments using a simple allen wrench you can store in the pistol grip:
Quick DA7 Operation Video

ETA: SLR Rifleworks is also a site sponsor.
View Quote


Or save $50 and DIY. Troy GB and a $.59 screw. I don't like the other design because it is difficult/impossible to adjust if it is under a long HG. You also will probably have to remove the suppressor for access. But you may need to mod the HG for the side access, so YMMV.



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Link Posted: 7/19/2013 12:23:30 PM EST
Appreciate the input folks. Decided to go with the DA7. Just placed the order.
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Link Posted: 7/19/2013 12:53:04 PM EST
Hansan: "This is a .30 caliber, gas operated, clip fed, semi-automatic rifle....."
Soldier: "Look, you ain't sellin it to me, you're only showing me how it works."
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Link Posted: 7/19/2013 1:50:44 PM EST
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Originally Posted By amphibian:
<Edited, you are going to have to register as a Dealer or Industry Partner to advertise here ......................dpmmn>

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MircoMOA has an industry forum

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Link Posted: 7/19/2013 1:53:03 PM EST
Hansan: "This is a .30 caliber, gas operated, clip fed, semi-automatic rifle....."
Soldier: "Look, you ain't sellin it to me, you're only showing me how it works."
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