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Thread: BCM Fail to Extract Questions

  1. #21
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    Grant, No doubt the rifle is 100% BCM. I understand it is very hard to troubleshoot anyting over the internet not in hand.

    Jimbo, I will post pics of spent cases ASAP.

    Of course I wanted to hear from someone, " Mine did the exact same thing, and this is what I did to fix it".

    At this point BCM's stance is shoot only 556 NATO, and that is the only thing that has been reliable.

    My opinion, I should be able to shoot any quality 223 or 556, and I would expect it to shoot most other ammo as well. It is possible I have a substandard lot of Indy, but the WWB is 556, and I know of many people that are able to shoot most ammo of choice with minimal issues, including Indy and forgien CRAP! I am in all my other rifles and pistols. It is very frustrating when peple I know do not understand or care to about the differences in a quality firearm/ammo and are able to run crap out of it with out proper cleaning, and have NO issues!

    I am inclined to believe it may be a combination of bad lot of ammo, chamber issue. I will follow up with BCM and continue to test and post updates.

    Any ideas why the ammo specs are vey similar with labeled specs, bullet type, weight, velocity, but the Federal seems like a magnum load as compared to the others in reference to felt recoil?

    I am somewhat a newbie to the AR's but have been shooting all my life, and consider my self an experienced shooter. With the cost and availabilty of ammo now it make it even harder to troubleshoot.

    Thanks for the feedback

  2. #22
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    Quote Originally Posted by Obscenejesster View Post
    I believe this is a buffer/buffer spring issue. Depending on where you get your rifle, parts like buffers could have been swapped prior to purchase.

    Go buy a carbine buffer and standard spring. This is the next trouble shooting step you should take. If everything works out, then just get most of your money back by selling your heavy buffer.

    Sent from my SGH-T999 using Tapatalk 4 Beta
    How would a buffer or spring contribute to a failure to extract?



    If a rifle fails to extract, I would be looking at either undersize chamber or problem with the extractor. Granted, crappy ammo could play a role, but there's a difference between truly crappy ammo and standard factory stuff like WWB. IMHO, a quality rifle like BCM should at least function with any factory round, .223 or 5.56 NATO. Likewise, cleaning and lube only go so far as to function expectations. Quality rifles with a properly cut chamber and a good BCG ought to be able to function reasonably well without meticulous cleaning or lubrication.

    I would start by rehabbing the BCG with a new extractor/spring/insert, maybe adding an O-ring ( http://www.bravocompanyusa.com/AR-15...-Parts-s/2.htm ). While I was waiting for that rebuild kit to arrive, I would get the chamber measured and reamed if necessary.
    Last edited by Hmac; 07-03-13 at 12:44.

  3. #23
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    Here Ya Go Jimbo Pics as Requested

    Bolt will lock open on an empty mag, but will not extract case when fired, but I can manually extract with bolt. If I load 5-10 rounds in the mag and mannually feed and extract it works as it should.

    I also removed the bolt an put a round in the bolt and the extractor grabs the rim and holds it tight.

    I really don't understand, the round has enough pressure to lock bolt on empty mag, which seems it would indicate the extractor. BUT it extracts all rounds when they are not fired.

    Attachment 17235

    Attachment 17236

    Attachment 17237

  4. #24
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    You need to get or borrow another bolt and do the test. I think the issue is the chamber but this will narrow it down.

    Quote Originally Posted by bjxds View Post
    Bolt will lock open on an empty mag, but will not extract case when fired, but I can manually extract with bolt. If I load 5-10 rounds in the mag and mannually feed and extract it works as it should.

    I also removed the bolt an put a round in the bolt and the extractor grabs the rim and holds it tight.

    I really don't understand, the round has enough pressure to lock bolt on empty mag, which seems it would indicate the extractor. BUT it extracts all rounds when they are not fired.

    Attachment 17235

    Attachment 17236

    Attachment 17237



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  5. #25
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    Quote Originally Posted by bjxds View Post
    Bolt will lock open on an empty mag, but will not extract case when fired, but I can manually extract with bolt. If I load 5-10 rounds in the mag and mannually feed and extract it works as it should.

    ...

    I really don't understand, the round has enough pressure to lock bolt on empty mag, which seems it would indicate the extractor. BUT it extracts all rounds when they are not fired.
    So, when the case is fired and expanded, it requires more force than the extractor can handle in order to get it out of the chamber. Unfired cases, therefore dimensionally normal, slide out just fine.

    Therefore, bad extractor or undersize chamber. You can replace the entire extractor mechanism for $30, or you can buy a new spring/O-ring/insert for $5. Or, as a quick test, you might be able to find an O-ring to try at your hardware store (they might even have Viton O-rings). Or you can try a borrowed bolt as IG suggests, but my money is on the chamber too.

  6. #26
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    If it was test fired at the factory, how would a tight chamber not be caught?
    Especially where it is excessively tight enough to cause a failure to extract.
    Quote Originally Posted by scottryan View Post
    Anybody that owns or sells pistol versions of assault rifles is a bottom feeder, irregardless of the ban status of certain ammunition.

    They are illigetimate weapons that have no real purpose other than to attract retards to the gun community.

  7. #27
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    Quote Originally Posted by polymorpheous View Post
    If it was test fired at the factory, how would a tight chamber not be caught?
    Especially where it is excessively tight enough to cause a failure to extract.
    Bingo. On top of this, the OP has ammo that WORKS in the gun (and is 5.56).




    C4

  8. #28
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    Well, if you figure it out, please let us know what you did to fix it. If you can, just start swapping parts by either borrowing them or buying them. If you still get the same results with different a different BCG or a different buffer then you know it's most likely a chamber issue.

    I knew someone who had this same problem and his issue ended up being an over gassed rifle.

    I see know reason why your rifle shouldn't be able to shoot good quality 223. A have a BCM upper that has so far ran at least 10 different kinds of ammo. Right now, it has a H2 buffer and a Blue Sprinco Spring and it will cycle Tula steel perfectly.

    Sent from my SGH-T999 using Tapatalk 4 Beta

  9. #29
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    Well here is the DEAL:

    Thanks for everyones feedback, it all really confirms what I knew all along. No one really knows,and it is impossible to fix over the internet.

    The only way to test is use ammo in other guns, then start swapping parts, which I do not think I should have to do on a new factory rifle.

    I understand there can be a bad anything from the best company in the world. What seperates great companies from good ones is customer service. BCM was fast to respond the first time and test the bolt, but I have not been able to get a response since then. There solution is to use Quality NATO spec 556. They must be 100% sure it is not a chamber issue, without testing it ??

    Based on some feedback I can agree the Indy ammo may be an issue, but the WWB 556 and Lake City also?? I know may people that are able to run just about anything. So if it is a chamber issue, why not with all ammo. In any case I have been able to shoot Federal XM193 with no issues at all. So BCM may be right after all.

    The reason I bought the BCM was because all of the positive feed back on quality and customer service, I do not feel I am getting now.

    I guess it is up to me to prove there is an issue with their rifle, it is not up to them to prove there is not. They have access to more BCM parts than I do. I guess it it up to me to do a complete test and troubleshooting. I will, and I will post results and the ultimate outcome.

    I am really disappointed and was planning on doing some quality shooting this weekend, not trying to troubleshoot a rifle from a top teir company.

    Thanks again for all the responses!

  10. #30
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    I got a complete 6920 upper I'd trade you for if you are not happy.
    PM me if interested.
    Quote Originally Posted by scottryan View Post
    Anybody that owns or sells pistol versions of assault rifles is a bottom feeder, irregardless of the ban status of certain ammunition.

    They are illigetimate weapons that have no real purpose other than to attract retards to the gun community.

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