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Thread: BCM Fail to Extract Questions

  1. #51
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    Aug 2011
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    I am very curious to hear how this gets resolved.
    I had persistent extraction issues in my Daniel Defense barrel with a FailZero BCG, that were immediately solved by using BCM extractor spring (no O-ring necessary).
    Seeing as how this is a factory BCM, I would assume the extractor spring is a stiff BCM one.
    I know some people have suggested using a lighter buffer and spring, but wouldn't using a heavier buffer and stiffer spring make more sense (to slow down the BCG velocity, reducing stress on the extractor).

  2. #52
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    Jun 2013
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    Try a new BCG!

    If the head space and gas tube is ok and no leaks, then your extractor and timing is an issue. Your machine is under gassed right now. What worked for me with same problem was I bought a new Young NM BCG! The original bcg i had - had a small gas leak issue that no one detected not even the mfg. they shoot 5.56 so the gas increase compensated for the small loss and did not detect an issue at the factory. Also, put the o-ring back in the extractor as it has a better grip on the casing when used. It is your BCG as long as your gas system is ok. Once you change the bcg you will find your system is over gassed now so go with an H2 buffer with your new bcg and watch the cycle and where your round eject. A 3:30 eject is perfect. Overgassed will eject forward and undergassed will eject way back. Buy a new one and return the bad one! I guarantee this will work and you will be able to shoot anything as it should be! You are probably losing gas due to poor BCG and every once in awhile even the best mfg have some issues.
    Last edited by American2013; 07-06-13 at 12:42.
    Keep your eyes on the horizon!

  3. #53
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    Quote Originally Posted by Benito View Post
    I am very curious to hear how this gets resolved.
    I had persistent extraction issues in my Daniel Defense barrel with a FailZero BCG, that were immediately solved by using BCM extractor spring (no O-ring necessary).
    Seeing as how this is a factory BCM, I would assume the extractor spring is a stiff BCM one.
    I know some people have suggested using a lighter buffer and spring, but wouldn't using a heavier buffer and stiffer spring make more sense (to slow down the BCG velocity, reducing stress on the extractor).
    This issue was due to bolt extractor so again we see bcg issue. A carbine should be over gassed by nature and it gets less so with mid size etc. Changing the extractor was smart indeed. If the headspace and gas tube are good then everything else will fall to the bcg. 90% of all issues will be the bcg IMHO. Buffer weight should only be used to fine tune the weapon only. Cutting springs means you are under gassed and have other issues ( usually the bcg). The AR design is good as it is (no need to cut parts,, ever) but sometimes you just need to swap a part or two usually related to the bcg. Just my two cents anyway!
    Last edited by American2013; 07-06-13 at 12:59.
    Keep your eyes on the horizon!

  4. #54
    Join Date
    Sep 2008
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    Any updates?

  5. #55
    Join Date
    Jan 2008
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    AZ-Waging jihad against crappy AR's.
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    Let me try and provide some troubleshooting 101 here. Until the OP tries another bolt, everyone is simply pissing in the pool to raise the water level.

    When troubleshooting, you first need to understand what is happening. That means the cycle of operation. When the OP made his post, he indicated that the round was not extracting from the chamber and another round was feeding into it. This is a classic sign of either a bad extractor or a tight chamber.

    This means we have to start at the basic level. Clean the chamber and check the extractor spring. If it is "mushy" then the spring is worn. I would also check the extractor lip.

    If everything is good-proceed to the next step. I would get some dummy rounds and attempt to cycle and extract them through. If it passes then we need to dig deeper. If it fails- considering the weapon is "cold" and the rounds haven't expanded in the chamber I would start to think barrel.

    But, we need to rule that out so we take another known quantity (in this case a bolt) and we test fire it. If it extracts then one must assume that the extractor/bolt is defective. At which time we can narrow it down further by changing the extractor spring assembly.

    If it fails to extract with the new bolt then I would start to think the barrel/chamber. At this point I would then contact BCM again- and I would fully explain in the English language in a way that can be comprehended what you did to troubleshoot it and then send the entire original upper/BCG back. This way they can walk right through the same steps that were performed and see what is wrong.

    Unless that port is severely undersized (sure it can happen) then we have to conclude it is the chamber.

    The last thing I would do is start dicking with things like springs and buffers because those are simply band aids for the true cause. These changes are generally fine tunings to make it ran better or smoother IMO.



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  6. #56
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    Jun 2013
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    UPDATE 1

    Since there has been many opinions on the cause and fix, I will give a quick recap/update.

    The first time I sent the BCG to BCM they tested it, and the main suspect was ammo. They said the weapon was built to run on NATO spec ammo. Everything they used in testing was NATO spec and had no issues. They reccomended trying other NATO Spec ammo and letting them know results.

    Well, I ran 20 rounds of Federal XM193F without an issue. I tried the original Indy, that is labed as NATO spec, and FTE. I ran 10 rounds of Winchester White box Q3131 FTE on almost every round. 20 more Federal and NO issues.

    Sooo, I am thinking there may?? be something to the ammo issue, but 2 out of 3 don't work ?. If it was not locking bolt on empty mag I could agree underpowered ammo. BUT Indy and WWB 556 labed NATO spec, are both so far out of spec the weapon will not Extract fired rounds? It is Not underpowered. ALSO if it was a chamber issue, why does only Federal function properly?

    I think the gun should run just about anything I feed it, 223 or 556 NATO. Limited intermittent issues with crap ammo I could understand, but not the amount and type of issues I am haveing.

    I thouroughly cleaned the gun, AGAIN, and was able to run 20 rounds of Indy with no issues, then back to the SOS, FTE on almost every round.

    I contacted BCM and they requested I send the upper and BCG for them to look at, even though ammo is a major suspect in cases like this.

    So far BCM has been very responsive, I hate to admit it, but I hope they do find a minor adjustment, and send it back fixed so I can run any ammo, have some fun and ROCK N ROLL!

    I will post updates after they have looked at it.

  7. #57
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    That's why you buy BCM,LMT, etc. no matter how good the manufacturer or product, things can and do go wrong sometimes. If something's wrong with the weapon they will stand behind it.

  8. #58
    Join Date
    May 2013
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    Quote Originally Posted by fred View Post
    That's why you buy BCM,LMT, etc. no matter how good the manufacturer or product, things can and do go wrong sometimes. If something's wrong with the weapon they will stand behind it.
    That's one of the main reasons why I bought a BCM, Top-notch customer service.

  9. #59
    Join Date
    Jun 2013
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    Received Upper

    Well, I wanted to give yall a quick update.

    I am all about customer service for a quality product, and so far it seems BCM is also.

    BCM returned my upper, but no explanation as to what they found, but it looks like a new upper/bcg??. I only had time to run about 2 mags, but no problems so far, I was able to fire 7 rounds of the WWB, that FTE on every round previously. So I am hopefull, but I am not getting to excited yet and saying all my problems are over, but it did feel different this time, a little different/ smoother, sometimes it just feels right.

    I also sent an email to BCM to find out what the fix was. I would like to know for my peace of mind.

    When I get time to spend a day at the range, I will post a follow up.

  10. #60
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    Jun 2012
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    Glad to hear it worked out... I really respect the people over at BCM for how they deal with their customers. Definitely let us know what they said the issue was because I was kinda baffled by it.

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