First build

Discussion in 'AR-15 Discussion' started by jjfuller1, Aug 24, 2012.

  1. jjfuller1

    jjfuller1 New Member

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    So it went together just fine no extra parts hehe. I will def do more in the future. Now on to the problem. One trigger pull, 2 rounds fired. Not just once or twice. Every trigger pull. Went thru 40 rounds this way. Then stopped shooting to investigate. Thinking it's an issue with the disconnector
     

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  2. okdonk

    okdonk New Member

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    What kind of fire control group in there?
     

  3. jjfuller1

    jjfuller1 New Member

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    Kies nickel boron single stage
     
  4. Quentin

    Quentin New Member

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    You're probably right that it's the disconnector. Definitely get this checked out by a quality gunsmith or buy another LPK and replace the fire control group. Did you buy the LPK locally or online, either way they should replace the FCG. If you're going to continue testing the rifle I'd never put more than 5 rounds in the mag for now. Maybe only 1, really. Anyway you sure don't want 30 to burp out!
     
  5. jjfuller1

    jjfuller1 New Member

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    But doesn't that sound fun? Bought the LPk and FCG separate. Gonna take it to a buddy of mine and also contact kies. On a good note I think it looks awesome. Lol
     
  6. Sentry18

    Sentry18 New Member

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    I agree on both counts; disconnector issues and it looking awesome. Nice work.
     
  7. JonM

    JonM Moderator

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    nice looking rifle.

    as for the trigger how light is the pull?? is it adjustable?? are you squeezing and holding or just tapping the trigger to fire??

    a good test is to clear the rifle, hold the trigger down pull the charging handle to the rear sharply and immediatly let it go. if you can pull the trigger and the hammer drops, your pretty much bump firing. its very common issue on some single stage triggers.

    if your bump firing by accident your going to have to work on technique or get a better single stage that isnt as prone to the issue
     
  8. jjfuller1

    jjfuller1 New Member

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    Its not adjustable. Not sure on pull I know it's the lightest i have. I shot it fast by releasing the trigger immediately after shot and also by holding for 2 to 3 seconds. It fired 2 rounds either way.
     
  9. jjfuller1

    jjfuller1 New Member

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    Note: the pin was very tight going into the trigger, and sear
     
  10. JonM

    JonM Moderator

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    try popping the lower off cocking the hammer and try and pull the hammer up into the fired position by hand without pulling the trigger. wiggle it around and see if it pops off the sear. i seriously doubt its the disconnector. if the disconnector fails it will just ride along with the bolt carrier and not set a round off. if there is a problem its going to be the sear and the shock of the bolt slamming home popping the hammer off the sear.

    you can also try just racking the bolt hard a few times and check to see if the hammer drops.
     
  11. AgentTikki

    AgentTikki New Member

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    Most common problems with new builds is having the disconnctor spring upside down.

    Check it again. The fatter end should be on the bottom.
     
  12. Quentin

    Quentin New Member

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    Good point about upside down springs, Tikki.

    From what I'm hearing, pulling the trigger fires a round then releasing the trigger fires another. If so it sure sounds like the disconnector to me - it grabs the hammer at first but the timing is off so it releases before the trigger sear catches the hammer.

    You should be able to prove whether this is the case by removing the upper then cock the hammer and catch it with your thumb as you pull the trigger. Keep the trigger held back and recock the hammer so that the disconnector catches it then release the trigger. Be ready to catch the hammer again with your thumb if it doesn't get caught by the trigger sear. Do this repeatedly and see what happens. This is a test I perform repeatedly on new lowers I build to ensure they operate properly.
     
    Last edited: Aug 25, 2012
  13. jjfuller1

    jjfuller1 New Member

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    Correct. I did this when it was first put in and it was okay. Now when I do it what happens is as you describe. I have to catch the hammer the second time after releasing the trigger
     
  14. jjfuller1

    jjfuller1 New Member

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    It's currently with my buddy otherwise I'd be tearing it apart right now. Gonna see what he says. Thanks for all your help. Hopefully it will be running soon