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Thread: Possible issue with semi-auto firing more than one round

  1. #1
    Join Date
    Jul 2011
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    Possible issue with semi-auto firing more than one round

    So today I went to an indoor range to test fire and and try different ammo types with my newly built AR-15. I first fired XM193, PMC, Wolf (to test steel case), then Prvi Partisan. My last trigger pull on the magazine loaded with Prvi Partisan 69gr appeared to have fired 2-3 rounds. These were the last rounds in the 20rd PMag I was using.

    This is on semi-auto using a LMT full-auto bolt carrier group with a USGI trigger from G&R Tactical's LPK. (I think it is also LMT.)

    Now, I'm not 100% sure what happened. I had been making slow and smooth trigger pulls. I don't remember double tapping the trigger. I do remember hearing 2-3 shots very quickly and the gun jerked a lot further to the left than it had previously (I was firing left handed). I'm not sure if more than one round even came out. I wasn't counting up to that point. Maybe the extra shots I heard were just other pistols on the range.

    What I want to know is - Is it possible for some malfunction somewhere in the gun to cause 2-3 rounds to fire on a single trigger pull on a semi-auto trigger?


    Note: the safety is also semi-auto.

  2. #2
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    It's happened to me several times with several different guns. Make sure you are gripping the pistol grip tightly.

  3. #3
    Join Date
    Apr 2007
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    Who installed your LPK?
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  4. #4
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    Check that the disconnector spring is in place and installed with the wide end down.

  5. #5
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    Yes and it is an issue that needs to be fixed. The lpk install is the first place to look.

    Do a search on doubles and you will get a ton of possible causes and fixes. With the setup you have I would be inclined to believe it is in the install and not bad parts.

    Someone more in the know than myself will be along but I wonder if being new could be a cause. A little burr or something.

  6. #6
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    Quote Originally Posted by Failure2Stop View Post
    Who installed your LPK?
    I did.

    As for the disconnector spring, I believe it is sitting in there with the wider end on the bottom. I'll have to check it when I get back from vacation.

  7. #7
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    Similar issue discussed here: http://m4carbine.net/showthread.php?t=93023

  8. #8
    Join Date
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    You have dog shit LPK parts.

    Happens with out of spec parts, hack trigger jobs, or badly worn parts.
    "You people have too much time on your hands." - scottryan

  9. #9
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    Quote Originally Posted by markm View Post
    You have dog shit LPK parts.

    Happens with out of spec parts, hack trigger jobs, or badly worn parts.
    That's interesting you say that, he states that he has a G&R lpk. Is something possibly starting to come out here? Uh no,no,no I uh definitely didn't mean to refer to them as "dog shit" parts hahahahaha

  10. #10
    Join Date
    Sep 2007
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    Yeah.. who knows? I had parts that did this from another equally reputable dealer.

    I couldn't really see that the hammer/trigger surfaces were defective. Ken Elmore could though....
    "You people have too much time on your hands." - scottryan

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