BPM AR-15 not ejecting

Discussion in 'Gunsmithing | Firearm Assembly | Troubleshooting' started by HPFilter, Sep 14, 2012.

  1. HPFilter

    HPFilter Lifetime Member

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    I finally got around to bringing my AR to the range to dial the scope in. That went well but every 3rd round or so wouldn't eject and feed the next round. Sometimes it would eject but jamb the next round.

    What should I look for? I'm out of ideas at this point.
     
  2. sig229r

    sig229r New Member

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    Call them up. A friend had the same issue and they asked him to bring it over(we were only 15 minutes away). Andrew Barnes helped us out. Ending up changing the bolt carrier group then went over to his private range.
     
  3. HPFilter

    HPFilter Lifetime Member

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    Hmm. I can call him but I'm not 15min away. I might just need to find someone local to CLT. I haven't got a clue on doing anymore then I did today. Not a fun time for sure.
     
  4. MarkG

    MarkG Registered Member

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    I'm guessing you've already been shaking the Googlebush, but here is a link to an archive message over at ar15.com that has some suggestions and linked threads that might help you diagnose. good Luck with that.

    http://3gn.ar15.com/archive/topic.html?b=3&f=66&t=543926

    For the crew here.

    What ammo were you using?
    More details on the problem?
    Were there any really odd marks on the case?
    Did you try different magazines and different ammo?
     
  5. HPFilter

    HPFilter Lifetime Member

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    Wolf Steel Case

    No. Perfect

    Just mags. My other BPM shot this same ammo without issues. If this one will not, it will be for sale.
     
  6. Dipper

    Dipper New Member

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    If this is a NEW rifle, I would give it some rounds with brass cased ammo and some break in before I went to the steel case stuff. What brand steel cased? Cheap low power stuff?? ( just saw the Wolf ) It makes a difference.
    I wouldn't blame the rifle right away.
    I would try some higher quality brass ammo and note the ejection pattern with it.... could be a gas issue where cheap low power stuff won't cycle.
     
    Last edited: Sep 14, 2012
  7. HPFilter

    HPFilter Lifetime Member

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    Not blaming. Again, my other BPM used Wolf without issues. Andrew always said that ammo isn't a problem with his stuff. There's something going on and I'm sure it's a simple fix. It's just knowing and having parts on hand to diagnose. I'm sure Andrew will respond to my email and some how we'll take care of it.
     
  8. MarkG

    MarkG Registered Member

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    Just out of curiosity will a Wolf steel case insert smoothly by hand to the proper depth and pull out smoothly?

    Can you tell if the gas tube into the gas carrier key is lined up ok.

    Did you dismantle the bolt to see if there is anything out of whack with it or the extractor? Maybe missing the black o-ring?

    On you other BPM, did you start off with Wolf steel case or was Wolf used after you had baptized it with other ammo?


    could be something as simple as a tight chamber and slightly out of spec steel cases.
     
  9. HPFilter

    HPFilter Lifetime Member

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    Wolf only. No need to use other stuff per Andrew. Cycles fine manually (not firing).

    Guess I need to figure out where this black o-ring is located.
     
  10. jlpskydive

    jlpskydive Staff Member Staff Member

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    Black O ring is on the extractor spring in the bolt. Pretty obvious if it has one.. I have some AR's with them and some without.

     
  11. HPFilter

    HPFilter Lifetime Member

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    I spoke with Andrew today (BPM) and we're going to meet at his place so he can take a look. I have no doubt that he will be able to get it going within minutes. I'll be sure to update this thread...
     
  12. Beef_Supreme

    Beef_Supreme New Member

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    Short stroke issue.
     
  13. Wahoo95

    Wahoo95 Club Subscribed

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    What lube are you using?
     
  14. mckenziedrums

    mckenziedrums Club Subscribed

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    Last two posts made me giggle.
     
  15. backwoodsshooter

    backwoodsshooter OEF 10-11

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    Any updates?
     
  16. HPFilter

    HPFilter Lifetime Member

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    OK.

    I'll find out tomorrow and be sure to update this thread.

    Why?

    Exactly what you told me to use, I'm a good student usually.
     
  17. Krabba

    Krabba Member

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    Something to do with short stroking and lube I would suspect.

    I'm sure Andrew will get you fixed up. I'm with you though, if won't run cheap steel I don't want it.
     
  18. Steve Sellers

    Steve Sellers Member

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    I would recommend two things:

    (1) make sure your gas rings are all intact and lubricated
    (2) buy and install this: BCM Extractor Upgrade Kit

    The only problem I've had with my BPM rifle was fixed when I corrected these two issues.

    FWIW I run almost exclusively steel-cased ammo in my rifle (after lots of brass-cased-only snobbery).
     
  19. mckenziedrums

    mckenziedrums Club Subscribed

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    Why did I giggle?

    Because they mention an issue with short stroke and lube... Obviously.
     
  20. cranbiz

    cranbiz Club Subscribed

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    I got it, I giggled a little too.

    Hope you get it fixed.
     

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