Ar15 2 round bursts

Discussion in 'AR-15 Discussion' started by revrentzero, Feb 25, 2013.

  1. revrentzero

    revrentzero New Member

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    I recently got my stag arms LPK and I installed the trigger group in my lower. When I was at the range over the weekend I loaded a 2 round clip just incase anything was the way it shouldn't buy everything was fine. After about 60-70 rounds I put a new pair of shooting gloves on and when I pulled the trigger it shot a 2 round burst that scared me. I immediately cleared the rifle and pulled the lower and found that the pin that holds that hammer had slid out of one side of the lower and the hammer was sitting crooked. I fixed that and put my cmmg conversion in (.22) and without the gloves on it did the burst again so I had to leave so I didnt raise any suspicion.
     
  2. AgentTikki

    AgentTikki New Member

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    How old is your lower?

    I understand tat your trigger assembly FCG is new. But the holes for your hammer and trigger pin may be out of spec.

    Id consider gettin some kns pins.
     

  3. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    Usually caused by the hammer tripping when the trigger is released. Once shot when you pull the trigger and one shot when you release it.
     
  4. revrentzero

    revrentzero New Member

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    My lower is brand new (new frontier), should I take it to a gun smith and have him check it out?
     
  5. EW1066

    EW1066 Member Supporter

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    You should call New Frontier. Tell them whats happening and give them a chance to make it right. Because whats happening isn't right. Is this a POLY lower? If it is they, will probably tell you to put the poly lpk back in it and see if it still happens. If the problem does not repeat, they will tell you it's the fault of the stag of the lpk. If it does, there is a possibility they will still blame the stag lpk or your installation there of. If their Customer service is what it should be they will make it right without question. If not you are now fore warned of possible scenarios they may pursue.

    EDUB
     
  6. SSGN_Doc

    SSGN_Doc Well-Known Member

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    A few variables to consider. Did you put all the Stag trigger parts? The legs of the FCG springs should engage grooves in the pins to keep them from walking. If the holes in the lower are not positioned properly then ther could be inadequate tension, or if the springs are not properly installed it could cause problems with the pins walking.

    Then the disconnector that fits in the tail of the trigger has a spring under it. Sometimes folks install the tapered spring upside down so that the narrow part goes in the recess in the trigger tail. This will prevent the disconnector from bring able to seat properly in the groove in the tail under operation. This can cause doubling if shots because it may engage sometimes, but maybe not all the time.

    So double check all of those springs for proper orientation. See if someone you know has a proper functioning AR that you can compare things to. See if the hole drilling was done in the proper spacing on your lower. Also do let New Frontier know if your problems if simple troubleshooting doesn't fix your problem. Check for small cracks around the pin holes as well.
     
  7. Squawk

    Squawk New Member

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    Why would you leave? What suspicion?
     
  8. JonM

    JonM Moderator

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    ill second this.
     
  9. GeneralPatton

    GeneralPatton New Member

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    Perhaps that someone would think he has tinkered around with the trigger mechanics in order to produce an automatic function, which would be a federal crime? Even if it was an honest mistake in reassembly, I'd rather not have to explain it either if a LEO happened to be present and asked about it.
     
  10. Jpyle

    Jpyle New Member

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    That he was possession of a full auto rifle. A malfunctioning semi-auto that fires multiple rounds with 1 trigger pull is a machine gun per BATFE regulations and a brand new machine gun gets you 10 years in the pokey.
     
    Last edited: Feb 25, 2013
  11. Squawk

    Squawk New Member

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    I'd just tell him I have a Class 3 and to **** off!

    J/K
     
  12. Jpyle

    Jpyle New Member

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    There was never a FA receiver made of polymer. :rolleyes: Besides, at this point in time any civilian owned FA rifle is over 30 years old...not brand spanking out of the box new.
     
  13. revrentzero

    revrentzero New Member

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    Ill double check everything inside just incase but I'm almost positive that everything was put in correctly. I did do a trigger job on it, could it be from that?
     
  14. EW1066

    EW1066 Member Supporter

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    What "Trigger job" did you do on it? Did you make changes to the sear engagement surfaces? If so, that could absolutely be the problem. Re install the NFA lpk back in the rifle, function check it and shoot it. If everything works then you did something wrong in your trigger work.

    I did a "15 min. trigger job" on my AR when I built it 3 years ago. Would I try that today on a new build? Hell no!

    As hard as LPKs are to come by these days, I wouldn't advise doing a homegrown trigger job to anyone. Bubba gunsmithing is not something we ,as a community, can enjoy right now as a result of the shortage of parts to fix an OOPS.

    EDUB
     
    Last edited: Feb 26, 2013