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Thread: Fail to extract, dobule feeds, etc

  1. #1
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    Fail to extract, dobule feeds, etc

    Guys,
    first of all - hello all, it is my first post here.
    Second - my english is not perfect so please excuse all of my mistakes.
    Next - i've serched all threads to find remedy to my problem but no luck.
    So here it is:
    AR15, 16" barrel, carbine lenght gas system, carbine buffer. About 6-8000 rounds. Most of all - steel case.
    It started to have fail to extract problem. First it started when rifle got hot (after 2-3 magazines fired).
    Usually case got stuck in chamber and it is difficult to extract it by reload rifle. Mortaring helps.
    At first it was only problem with steel cases, but after few weeks brass cases were also afected.
    Cases look normal - no deformations or anything strange on them.
    I've cleaned rifle and chamber (didn't help), changed gas rings and extractor, put new buffer spring and even switched
    BCG from other rifles. All of that didn't help.
    Today rifle FTE almost every single shot - even when its cold. It is impossible to shot with it. I tried adjustable gas block but
    it was even worse - FTE, bolt doesn't stop after last round, dobule feeds, problem with chambering, no reload. One strange thing - when rifle is cold i have no
    problem with manual extraction. When gets hot - it is difficult to extract. But FTE occurs both - on cold and hot rifle.
    I don't know what to do. I need any help. I would bring my rifle to gunsmith but there are no good one in my area.
    Friend of my suggested that it might be a problem with chamber but... i don't know how to check it or what to do with this issue.

    Anyway - i would be totally gratefull for you help.

    Best

    4ever
    Last edited by 4Ever; 06-21-16 at 16:30.

  2. #2
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    If the BCG was replaced and didn't solve the issue, then it's safe to say the BCG isn't the problem.

    When you used an adjustable gas block, are you sure that you installed and aligned it correctly? Have you considered replacing the gas tube?

    Did you replace the extractor spring?

    When you say "double feed" do you mean two live rounds going into the chamber? Or do you mean a casing is in the chamber and a live round is feeding into it?



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  3. #3
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    4ever,

    Before you tear your rifle apart, I highly recommend a good cleaning with a chamber brush and some carbon remover/solvent. Metal cased ammunition is notorious for creating a dirtier chamber than normal, as compared to brass cased ammunition. The reason being, is that steel cases do not expand as much into the chamber allowing carbon to blow into the chamber and foul that area. You have to clean the chamber more so than if you used brass cased ammunition. It is typical to have extraction issues with brass cased ammo after shooting steel cased ammo because the brass will expand into the chamber more than steel. With extra carbon in the chamber, the brass cased ammo will become stuck, requiring the rifle to be mortared.

    Another item some folks tend to do is under lubricate the rifle. It doesn't need oil dripping from every gap in the gun, but they do tend to run better wet than dry.

    Chamber brush:
    http://www.google.com/shopping/produ...hgaxoCOsfw_wcB
    Life's a risk, enjoy the adventure - HOPLOETHOS

  4. #4
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    Per his original post-

    I've cleaned rifle and chamber (didn't help), changed gas rings and extractor, put new buffer spring and even switched BCG from other rifles. All of that didn't help.

    Quote Originally Posted by Slvr Surfr View Post
    4ever,

    Before you tear your rifle apart, I highly recommend a good cleaning with a chamber brush and some carbon remover/solvent. Metal cased ammunition is notorious for creating a dirtier chamber than normal, as compared to brass cased ammunition. The reason being, is that steel cases do not expand as much into the chamber allowing carbon to blow into the chamber and foul that area. You have to clean the chamber more so than if you used brass cased ammunition. It is typical to have extraction issues with brass cased ammo after shooting steel cased ammo because the brass will expand into the chamber more than steel. With extra carbon in the chamber, the brass cased ammo will become stuck, requiring the rifle to be mortared.

    Another item some folks tend to do is under lubricate the rifle. It doesn't need oil dripping from every gap in the gun, but they do tend to run better wet than dry.

    Chamber brush:
    http://www.google.com/shopping/produ...hgaxoCOsfw_wcB



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  5. #5
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    Quote Originally Posted by Iraqgunz View Post
    If the BCG was replaced and didn't solve the issue, then it's safe to say the BCG isn't the problem.
    Agree.

    Quote Originally Posted by Iraqgunz View Post
    When you used an adjustable gas block, are you sure that you installed and aligned it correctly? Have you considered replacing the gas tube?
    I'm pretty sure i aligned and installed adjustable gas block correctly. In fact i did it twice to be extra sure.
    Strange thing - my gas tube is a little loose in adjustable gas block - but no gas leaks i double checked it.
    I'm considering replacing my gas tube except i don't have access to parts (i live in Europe - my gun dealer is waiting for parts).
    Do you think it could be gas tube problem?

    Quote Originally Posted by Iraqgunz View Post
    Did you replace the extractor spring?

    When you say "double feed" do you mean two live rounds going into the chamber? Or do you mean a casing is in the chamber and a live round is feeding into it?
    Nope - i did not replace extractor spring because i replaced whole BCG - this included almost brand new bolt with almost new extractor spring. It didn't help.
    I don't think this is extractor issue - i have no problem with manual extraction even if the case is really stuck in chamber (mortaring helps).

    By double feed i meant case is in the chamber and live round is feed into it.

    Many thanks for your answer.

  6. #6
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    Quote Originally Posted by Slvr Surfr View Post
    4ever,

    Before you tear your rifle apart, I highly recommend a good cleaning with a chamber brush and some carbon remover/solvent.
    Thanks. I did it. My chamber right now is shiny and clean as new. Didn't help.

    One more thing - i have feelings that my rifle shots uneven right now. I mean sometimes it feels overgases and sometimes undergases (kicks more/less). I don't know how to explain
    this and maybe it is only my imagination but for me this rifle run different then when was ok.
    Next time i will try to videotype those malfunctions.
    Last edited by 4Ever; 06-22-16 at 01:42.

  7. #7
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    I think you have at least a gas issue. Can you post a picture of the gas block/barrel area? Also, a casing in the chamber and then a round feeding into it, is usually indicative of a chamber/extraction problem.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  8. #8
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    Quote Originally Posted by Iraqgunz View Post
    I think you have at least a gas issue. Can you post a picture of the gas block/barrel area? Also, a casing in the chamber and then a round feeding into it, is usually indicative of a chamber/extraction problem.
    I'll send pictures later. I'll send pictures of my chamber area. But i've switched back to the old (non adjustable) gas block. Haven't tried to shot with it yet thought. What can cause a chamber problem?

  9. #9
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    Quote Originally Posted by 4Ever View Post
    snip/....About 6-8000 rounds. Most of all - steel case....
    Hows the accuracy? Any key holing?

    I recall a review where a couple Bushmasters started to have issues after 8k (I think) of steel case ammo. Eroded gas ports and bores worn out.

  10. #10
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    No key holing. Accuracy? I use this rifle mostly to shot under 100 meteres whlile moving, etc so haven't checked accuracy. I'm still able to hit a 7" steel plate at this distance.
    I also saw that review but they shot full auto and did it in one day - so thats way those barrels worn out so quickly.

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