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Mar 25th, 2012
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Help! My AR pistol has turned into a single shot #6973740
11/27/17 03:19 PM
11/27/17 03:19 PM
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Bells,TX (east of Sherman)
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Will not pick up next round on mag. Tried different ammo, cleaned, different mags and no help. Gas block does not appear to be adjustable. Is there a AR pistol guru on THF that I can send this bad boy to?

Re: Help! My AR pistol has turned into a single shot [Re: rackjudge] #6973752
11/27/17 03:25 PM
11/27/17 03:25 PM
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Wolfe City, TX
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Undergassed, is my bet.

In my limited AR experience, I've decided I will not own an AR without an adjustable gas block.

I installed a Syrac adjustable gas block on my LR-308 that was ejecting at 1 o'clock (over-gassed). Easy to instal and it solved the problem.



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Re: Help! My AR pistol has turned into a single shot [Re: rackjudge] #6973932
11/27/17 06:18 PM
11/27/17 06:18 PM
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Either your gas block has shifted, or your gas port/tube is clogged.


The secret to a long life is to try not to shorten it

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Re: Help! My AR pistol has turned into a single shot [Re: rackjudge] #6974011
11/27/17 07:13 PM
11/27/17 07:13 PM
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Wise Co.
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Yup...I can imagine a really, REALLY gunked up bolt doing that too. Maybe.




I'm here to give and receive knowledge, not affirmation or adoration. If you don't like it, mierda dura. Intellectual honesty is not for fragile egos.
Re: Help! My AR pistol has turned into a single shot [Re: FiremanJG] #6974225
11/27/17 09:45 PM
11/27/17 09:45 PM
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Texas
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Originally Posted By: FiremanJG
Undergassed, is my bet.

In my limited AR experience, I've decided I will not own an AR without an adjustable gas block.

I installed a Syrac adjustable gas block on my LR-308 that was ejecting at 1 o'clock (over-gassed). Easy to instal and it solved the problem.


Correct that it sounds like the gun is undergassed. However, an adjustable gas block will not help at all if indeed the gun is undergassed. Adjustable gas blocks simply allow the user to restrict gas flow (like you experienced with your LR-308), but they don't give you any extra gas flow over a standard gas block. The size of the gas port in the barrel determines that.

OP - It is likely that your gas block has shifted, or you have gas leaking from the gas tube (usually occurs where tube fits into block). Take the gas tube and block off the gun and look at the ring of carbon buildup around the gas port on the barrel. Gas port should be perfectly centered in the carbon ring, i.e. there should be an even amount of buildup all around the port. If it's not, that will tell you that your gas block shifted. Simply reinstall the block in the proper location and you should be good. If the gas port is centered in the carbon when you look, blow compressed air through the gas tube. You should be able to feel if air is escaping anywhere. That will tell you if you need to replace your gas tube.


"God made man, but Samuel Colt made them equal."
Re: Help! My AR pistol has turned into a single shot [Re: Tactical Cowboy] #6974229
11/27/17 09:50 PM
11/27/17 09:50 PM
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Originally Posted By: Tactical Cowboy
Either your gas block has shifted, or your gas port/tube is clogged.


People like to talk about gas tubes clogging, but it doesn't really happen. Anything is possible, but with the amount of pressure flowing through that tube when you shoot, it's highly improbable that a clog would ever be able to form.


"God made man, but Samuel Colt made them equal."
Re: Help! My AR pistol has turned into a single shot [Re: TTUhunter4] #6974234
11/27/17 09:53 PM
11/27/17 09:53 PM
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Fort Worth
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Originally Posted By: TTUhunter4
Originally Posted By: Tactical Cowboy
Either your gas block has shifted, or your gas port/tube is clogged.


People like to talk about gas tubes clogging, but it doesn't really happen. Anything is possible, but with the amount of pressure flowing through that tube when you shoot, it's highly improbable that a clog would ever be able to form.


My cardiologist disagrees when I provide this very same explanation to him....


I smell Bacon
Re: Help! My AR pistol has turned into a single shot [Re: TTUhunter4] #6974264
11/27/17 10:27 PM
11/27/17 10:27 PM
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Originally Posted By: TTUhunter4
Originally Posted By: Tactical Cowboy
Either your gas block has shifted, or your gas port/tube is clogged.


People like to talk about gas tubes clogging, but it doesn't really happen. Anything is possible, but with the amount of pressure flowing through that tube when you shoot, it's highly improbable that a clog would ever be able to form.


Didn't say it was likely.


The secret to a long life is to try not to shorten it

Powder coated cast bullets available. https://www.facebook.com/lazyhbullets/
Re: Help! My AR pistol has turned into a single shot [Re: TTUhunter4] #6974273
11/27/17 10:39 PM
11/27/17 10:39 PM
Joined: Dec 2008
Posts: 26,669
Wolfe City, TX
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Originally Posted By: TTUhunter4
Originally Posted By: FiremanJG
Undergassed, is my bet.

In my limited AR experience, I've decided I will not own an AR without an adjustable gas block.

I installed a Syrac adjustable gas block on my LR-308 that was ejecting at 1 o'clock (over-gassed). Easy to instal and it solved the problem.


Correct that it sounds like the gun is undergassed. However, an adjustable gas block will not help at all if indeed the gun is undergassed. Adjustable gas blocks simply allow the user to restrict gas flow (like you experienced with your LR-308), but they don't give you any extra gas flow over a standard gas block. The size of the gas port in the barrel determines that.

It is likely that your gas block has shifted, or you have gas leaking from the gas tube (usually occurs where tube fits into block). Take the gas tube and block off the gun and look at the ring of carbon buildup around the gas port on the barrel. Gas port should be perfectly centered in the carbon ring, i.e. there should be an even amount of buildup all around the port. If it's not, that will tell you that your gas block shifted. Simply reinstall the block in the proper location and you should be good. If the gas port is centered in the carbon when you look, blow compressed air through the gas tube. You should be able to feel if air is escaping anywhere. That will tell you if you need to replace your gas tube.


But of course!

Learn something new every day.



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Re: Help! My AR pistol has turned into a single shot [Re: rackjudge] #6974595
11/28/17 03:08 AM
11/28/17 03:08 AM
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Eastland County
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Aluminum gas blocks will erode and cause gas to leak out from the sides.

Re: Help! My AR pistol has turned into a single shot [Re: rackjudge] #6974694
11/28/17 05:32 AM
11/28/17 05:32 AM
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Texas
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Blockage or leak causing a gas shortage like described above and good way to check for it above.

That or you let FiremanJG handle your AR as there is a History peep bolt

cheers

Re: Help! My AR pistol has turned into a single shot [Re: rackjudge] #6976001
11/29/17 12:12 PM
11/29/17 12:12 PM
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Bells,TX (east of Sherman)
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Very helpful. Thanks guys

Re: Help! My AR pistol has turned into a single shot [Re: rackjudge] #6977033
11/30/17 01:46 AM
11/30/17 01:46 AM
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Central Texas
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Check the gas rings on the bolt. If the slits have somehow managed to align themselves it will cause undergassing.


"I have no idea what WW-III will be fought with, but WW-IV will be fought with sticks and stones."

A. Einstein

Re: Help! My AR pistol has turned into a single shot [Re: Slow Drifter] #6977075
11/30/17 02:21 AM
11/30/17 02:21 AM
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Originally Posted By: Slow Drifter
Check the gas rings on the bolt. If the slits have somehow managed to align themselves it will cause undergassing.


This is a myth. No need to worry about alignment of gas rings on an AR-15.

Now, if they are worn out they should be replaced, but alignment of gas rings causing gas issues is a myth that has been proven false time and time again.


"God made man, but Samuel Colt made them equal."
Re: Help! My AR pistol has turned into a single shot [Re: TTUhunter4] #6977079
11/30/17 02:25 AM
11/30/17 02:25 AM
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Originally Posted By: TTUhunter4
Originally Posted By: Slow Drifter
Check the gas rings on the bolt. If the slits have somehow managed to align themselves it will cause undergassing.


This is a myth. No need to worry about alignment of gas rings on an AR-15.

Now, if they are worn out they should be replaced, but alignment of gas rings causing gas issues is a myth that has been proven false time and time again.


I'm just going to stick with what the Marine Corps taught me. Honestly, I really don't see how it could cause the issue since they're outside the gas tube port on the bolt.


"I have no idea what WW-III will be fought with, but WW-IV will be fought with sticks and stones."

A. Einstein

Re: Help! My AR pistol has turned into a single shot [Re: TTUhunter4] #6977088
11/30/17 02:39 AM
11/30/17 02:39 AM
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Originally Posted By: TTUhunter4
Originally Posted By: Slow Drifter
Check the gas rings on the bolt. If the slits have somehow managed to align themselves it will cause undergassing.


This is a myth. No need to worry about alignment of gas rings on an AR-15.

Now, if they are worn out they should be replaced, but alignment of gas rings causing gas issues is a myth that has been proven false time and time again.


Yup


The secret to a long life is to try not to shorten it

Powder coated cast bullets available. https://www.facebook.com/lazyhbullets/
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