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Thread: Malfunction diagnosis

  1. #1
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    Malfunction diagnosis

    Need some ideas on what may have caused this problem. The details are a little fuzzy because I didn't have time to stop and pay attention to what was going on during this course of fire.

    What happened was I fired a round, the case extracted and then the bolt got hung up. I tapped the mag and the bolt closed and fed a round. Fired, same thing happened again. Tapped the mag, bolt closed and fed a round and then no further issues for the rest of the day. This was on my third mag or so. Shot probably 150 rounds or so that day, so it happened pretty much square in the middle of the session.

    So that almost sounds like it was short stroking (ammo? no reason to suspect the gas system yet, it has been solid so far) but it still managed to feed a round. I suppose the mag might not have been seated, but twice? It was an old USGI mag.

    Just trying to understand what may have been going on.

    Thanks

  2. #2
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    I assume you shot the same ammo all day. So, I personally would trash the mag and move on.

  3. #3
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    Wasn't all the same ammo, so I can't really confirm there

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    Fuzzy is an understatement...
    What gun, what config, what ammo? How was it "hung up"? Did it go into battery upon tapping the mag? Did you note which mag this was?
    Not trying to be an ass but it's hard enough trying to analyze things over the net. It makes it next impossible without more details.
    Last edited by Col_Crocs; 05-27-14 at 18:34.

  5. #5
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    Quote Originally Posted by Col_Crocs View Post
    Fuzzy is an understatement...
    What gun, what config, what ammo? How was it "hung up"? Did it go into battery upon tapping the mag? Did you note which mag this was?
    Not trying to be an ass but it's hard enough trying to analyze things over the net. It makes it next impossible without more details.
    Can't confirm on the ammo, I had two or three different types loaded. Most was 55gr but there were a few heavier rounds as well.

    For the config it is a Rainier Arms match 16" barrel and gas block, BCM BCG, mid length gas system with a H buffer, standard spring. And yes, tapping the mag did cause it to go into battery and successfully feed the round. So the BCG made it far enough back to eject the spend case, and started to feed the next and got bound up at that point. Not sure how full the mag was at this point.
    Last edited by siegrisj; 05-27-14 at 18:49.

  6. #6
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    So it was isolated only to one magazine? And it shot fine afterwards?

  7. #7
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    Unless you can provide more info, we can only guess what went on since we have no ammo info, magazine info, etc..



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    Likely your mag.

  9. #9
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    From the details given, I would say it was the magazine. I have had a few hangups like that using D&H mags (all 3 where bought together and all three had the same problem... never had any problems with other D&Hs ???).

  10. #10
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    Yes, one mag. And it's an old USGI mag.

    So if it is a mag, what is happening? Weak follower spring?

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