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Thread: Brand New BCM rifle --I MODIFIED-- *Failure To Eject*

  1. #21
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    Brand new upper and the BCM lower was just shot shortly probably around 500 rounds with another BCM upper (14.5, FSB, Mid-length) that had no issues with that previous upper. I'll be going to the range tomorrow with my other never fired BCM rifle (14.5, FSB, Mid-length) and my older (14.5, FSB, Mid-length) with no issues with over 2k rounds ran. I'll be swapping out BCG's and Factory New lowers.

  2. #22
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    Op, pop a new/functional bolt in there and see what happens. Something is wrong with your bolt/ejector. If the bolt is moving far enough to strip a new round, it's moving far enough to eject. If he had too much buffer weight causing a short stroke sufficient to hinder ejection, the fired case would still be in the chamber and a new round would not be stripped from the mag. The bolt only needs to travel just past the latch on the ejection port cover to eject the case. This leaves the bolt about 3/8" short of stripping a new round from the mag.
    Last edited by samuse; 06-17-16 at 14:08.

  3. #23
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    It's the extractor. Every time an AR has trouble with bolt overs it's the extractor. It's not the magazine, it's not the buffer, it's not the ammo. It's the extractor. The extractor loses control of the empty case before the mouth clears the forward edge of the ejection port. You'll have to play with a dummy round & an empty in your rifle to see why this is so because I'm too doped up after having wisdom teeth pulled to explain further
    Last edited by MistWolf; 06-17-16 at 14:06.
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  4. #24
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    I went digging around a little bit in the rifle, and noticed this. Corrosion on the tip of the gas tube and what it looks to be rust on the feed ramp, at least it wouldn't wipe off after I took the pic, and I don't think that's from the projectile scraping...idk any insight? None of my other rifles have any of this. And one pic of the extractor lip with brass shavings.




  5. #25
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    Quote Originally Posted by BCMNick View Post
    I went digging around a little bit in the rifle, and noticed this. Corrosion on the tip of the gas tube and what it looks to be rust on the feed ramp, at least it wouldn't wipe off after I took the pic, and I don't think that's from the projectile scraping...idk any insight? None of my other rifles have any of this. And one pic of the extractor lip with brass shavings.
    Were did you buy the upper new??

    Seems like excessive corrosion from the ammo and round count you stated??


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  6. #26
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    Bought it new from BCM, got it on June 5th, one range trip, only 57 rounds non corrosive ammo...

  7. #27
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    That green residue is usually from shooting and a mixture of cleaning solvents.



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  8. #28
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    Corrosion on the feed ramps wouldn't cause extraction issues. This still seems like an extractor, extractor spring, or ejector spring issue.

  9. #29
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    I think Iraqgunz already provided exactly the right things to do and check. It takes maybe 2 minutes to pull the BCG, pop out the bolt and extractor to check the extractor spring for the extra o-ring or binding.

    Also, I think you're mixing terms as your photos show that the spent casing was extracted from the chamber, but not ejected. If your extractor is too tight, that can happen or there can be something wrong with your ejector pin/spring.

    You could probably replicate the failure with spent casings and manually cycling the bolt. If you determine that it's a BCM issue, I'm sure they'll make it right.

  10. #30
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    The first pic looks like a FTextract, the other two look like FTEject.

    OP just needs to change the bolt. The whole bolt. Try to get BCM to swap the bolt for you. Kill the problem with fire. Don't mess around with the tiny stuff. Fix it.

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