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Help! My AR pistol has turned into a single shot
#6973740
11/27/17 03:19 PM
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Joined: Jan 2008
Posts: 1,488
rackjudge
OP
Pro Tracker
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OP
Pro Tracker
Joined: Jan 2008
Posts: 1,488 |
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?
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Re: Help! My AR pistol has turned into a single shot
[Re: rackjudge]
#6973752
11/27/17 03:25 PM
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Joined: Dec 2008
Posts: 41,082
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,082 |
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.
800 Yard Steel Range Precision Rifle Instruction Memberships and Classes Available
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Re: Help! My AR pistol has turned into a single shot
[Re: rackjudge]
#6973932
11/27/17 06:18 PM
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Joined: Aug 2011
Posts: 6,168
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,168 |
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
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Joined: Nov 2007
Posts: 9,501
RiverRider
THF Trophy Hunter
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THF Trophy Hunter
Joined: Nov 2007
Posts: 9,501 |
Yup...I can imagine a really, REALLY gunked up bolt doing that too. Maybe.
"Arguing with you always makes me thirsty." -Augustus McRae
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Re: Help! My AR pistol has turned into a single shot
[Re: J.G.]
#6974225
11/27/17 09:45 PM
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Joined: Jul 2010
Posts: 746
TTUhunter4
Tracker
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Tracker
Joined: Jul 2010
Posts: 746 |
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."
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Re: Help! My AR pistol has turned into a single shot
[Re: Tactical Cowboy]
#6974229
11/27/17 09:50 PM
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Joined: Jul 2010
Posts: 746
TTUhunter4
Tracker
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Tracker
Joined: Jul 2010
Posts: 746 |
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."
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Re: Help! My AR pistol has turned into a single shot
[Re: TTUhunter4]
#6974234
11/27/17 09:53 PM
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Joined: Aug 2015
Posts: 4,053
Pig_Popper
Extreme Tracker
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Extreme Tracker
Joined: Aug 2015
Posts: 4,053 |
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....
This space is For Sale - inquire within ...
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Re: Help! My AR pistol has turned into a single shot
[Re: TTUhunter4]
#6974264
11/27/17 10:27 PM
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Joined: Aug 2011
Posts: 6,168
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,168 |
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.
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Re: Help! My AR pistol has turned into a single shot
[Re: TTUhunter4]
#6974273
11/27/17 10:39 PM
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Joined: Dec 2008
Posts: 41,082
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,082 |
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.
800 Yard Steel Range Precision Rifle Instruction Memberships and Classes Available
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Re: Help! My AR pistol has turned into a single shot
[Re: rackjudge]
#6974595
11/28/17 03:08 AM
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Joined: Feb 2011
Posts: 857
songdogslayer
Tracker
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Tracker
Joined: Feb 2011
Posts: 857 |
Aluminum gas blocks will erode and cause gas to leak out from the sides.
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Re: Help! My AR pistol has turned into a single shot
[Re: rackjudge]
#6974694
11/28/17 05:32 AM
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Joined: Sep 2006
Posts: 32,442
kmon11
junior
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junior
Joined: Sep 2006
Posts: 32,442 |
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
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
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Re: Help! My AR pistol has turned into a single shot
[Re: rackjudge]
#6976001
11/29/17 12:12 PM
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Joined: Jan 2008
Posts: 1,488
rackjudge
OP
Pro Tracker
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OP
Pro Tracker
Joined: Jan 2008
Posts: 1,488 |
Very helpful. Thanks guys
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Re: Help! My AR pistol has turned into a single shot
[Re: rackjudge]
#6977033
11/30/17 01:46 AM
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Joined: Apr 2009
Posts: 5,558
Slow Drifter
THF Trophy Hunter
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THF Trophy Hunter
Joined: Apr 2009
Posts: 5,558 |
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
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Re: Help! My AR pistol has turned into a single shot
[Re: Slow Drifter]
#6977075
11/30/17 02:21 AM
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Joined: Jul 2010
Posts: 746
TTUhunter4
Tracker
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Tracker
Joined: Jul 2010
Posts: 746 |
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."
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Re: Help! My AR pistol has turned into a single shot
[Re: TTUhunter4]
#6977079
11/30/17 02:25 AM
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Joined: Apr 2009
Posts: 5,558
Slow Drifter
THF Trophy Hunter
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THF Trophy Hunter
Joined: Apr 2009
Posts: 5,558 |
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
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Re: Help! My AR pistol has turned into a single shot
[Re: TTUhunter4]
#6977088
11/30/17 02:39 AM
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Joined: Aug 2011
Posts: 6,168
Tactical Cowboy
THF Trophy Hunter
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THF Trophy Hunter
Joined: Aug 2011
Posts: 6,168 |
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.
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