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Thread: BCM Fail to Extract Questions

  1. #41
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    Quote Originally Posted by Iraqgunz View Post

    Please Note:While the 5.56x45mm NATO and .223 Remington are interchangeable, the 5.56 is a military round that runs at higher pressures than its .223 counterpart.
    Right. How much does the explosion and resultant recoil impulse of a given round aid in its extractability?

    Is there some chamber measurement, tighter than spec, where the increased expansion of a fired NATO casing would be overcome by the increased recoil and still be extractable, while a .223 round in the same chamber, with its lesser degree of expansion but lower recoil pulse wouldn't be extractable?
    Last edited by Hmac; 07-04-13 at 12:05.

  2. #42
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    All I know is that what is being described is indicative of a faulty extractor or tight chamber. If he puts another bolt in it, and it does the same thing I would start to focus hard on the barrel/chamber.

    My BCM barrel have all fired everything from PMC Bronze Line, Federal M193 and clones, M855 and clones, Hornady Steel TAP and others 100% of the time.

    Quote Originally Posted by Hmac View Post
    Right. How much does the explosion and resultant recoil impulse of a given round aid in its extractability?

    Is there some chamber measurement, tighter than spec, where the increased expansion of a fired NATO casing would be overcome by the increased recoil and still be extractable, while a .223 round in the same chamber, with its lesser degree of expansion but lower recoil pulse wouldn't be extractable?



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  3. #43
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    Is it possible the gas rings might be out of spec?

  4. #44
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    Just a couple days ago, someone on THR posted what seems to be the she problem you're having with a BCM BCG.

    Looks like a heavier buffer fixed his failure to extract issues.

    http://www.thehighroad.org/showthread.php?t=721042

    Sent from my SGH-T999 using Tapatalk 4 Beta

  5. #45
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    Quote Originally Posted by Obscenejesster View Post
    Just a couple days ago, someone on THR posted what seems to be the she problem you're having with a BCM BCG.

    Looks like a heavier buffer fixed his failure to extract issues.

    http://www.thehighroad.org/showthread.php?t=721042

    Sent from my SGH-T999 using Tapatalk 4 Beta
    There is so much wrong with that thread and rifle/barrel/ammo in question. THR makes arfcom look like a certified armorers convention.

    A heavier buffer could have fixed his issue because he has inferior parts and was running a completely over-gassed AR Stoner barrel, not because he's using a BCM bcg. The op also running a BCM carrier doesn't mean a heavier buffer is his fix.

  6. #46
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    Swap the bcg if it still has a problem check the chamber if the problem goes away get a new bolt or extractors.

  7. #47
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    Re: BCM Fail to Extract Questions

    Quote Originally Posted by ScatmanCrothers View Post
    There is so much wrong with that thread and rifle/barrel/ammo in question. THR makes arfcom look like a certified armorers convention.

    A heavier buffer could have fixed his issue because he has inferior parts and was running a completely over-gassed AR Stoner barrel, not because he's using a BCM bcg. The op also running a BCM carrier doesn't mean a heavier buffer is his fix.
    Yes, I understand it's not just because he's using a BCM BCG. If you read my previous post, you would see that I stated that I've been able to run all ammo types with my BCM BCG's. I'm not trying to say just because it's a BCM BCG that it somehow the same problem. I run BCM BCG's and to be honest, that's what I like the most.

    What I was trying to say but it obviously came out the wrong way was..... Everyone in that forum was suggesting he change his Extractor or entire BCG when all along, it had nothing to do with it.

    Sometimes things aren't always what they seem. Sometimes it can be hard diagnosing issues over the Internet and all you can do is make suggestions.

    Sent from my SGH-T999 using Tapatalk 4 Beta

  8. #48
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    Use process of elimination. Like already said swap the bolt/bcg, if still an issue have the chamber checked. I doubt this is the issue but I would also try with and without an o-ring on the extractor spring before swapping out the bolt/bcg. Again I doubt this is the issue but swap buffers too. It wouldn't hurt to put a couple hundred rounds through it with the ammo that did work.

    Your best bet would be to get it checked out.

  9. #49
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    I agree with the tight chamber is the problem (Dwell time) Cartridge is still expanded when bolt is trying to extract. A heavier buff may get it slowed down enough to allow exatraction but your not solving the problem. BCM says its ok so they will not correct a problem they say isn't there. So the only option you have is to get a chamber reamer an do it yourself. Fire enough of the ammo that works to get it broke in enough to function with other ammo /sell it a cut your losses.

  10. #50
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    my bcg done this EXACT same thing (mine is also a BCM) when i built mine i used the paste style frog lube took it out to fire it the next weekend and this same thing happen i also tried several different loads and mags.... but nothing woulf feed and discharge correctly.... had to completely disassemble the bcg cleaned it all with rubbing alcohol as well as the upper receiver.... then used the liquid style frog lube and has not had an issue since i have fired about 800 rounds with no problem

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