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Thread: Weapon fires during trigger re-set while dry firing.

  1. #1
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    Weapon fires during trigger re-set while dry firing.

    I just recived my BCM midlength upper back from the gunsmith where a troy rail was installed. I have a BCM BCG and BCM Gun Fighter charging handle. During a functions check I pull the trigger, hold it to the rear, cycle the bolt and let the trigger move forward to dry fire again but the weapon "fires" when I release the trigger instead of resetting.
    Last edited by usmcvet; 08-21-10 at 10:00. Reason: LMT Defender stock lower & trigger.
    "Real men have always needed to know what time it is so they are at the airfield on time, pumping rounds into savages at the right time, etc. Being able to see such in the dark while light weights were comfy in bed without using a light required luminous material." -Originally Posted by ramairthree

  2. #2
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    Was any work done to the lower? Did it do this before it was sent off to the gunsmith? If I had to guess, something is out of spec with the disconnector and it is releasing the hammer prior to the sear getting in place properly. This would have nothing to do with the upper.

  3. #3
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    what would happen if you fired live rounds with this? Visit from the ATF?

  4. #4
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    I'm with emt370... Nothing to do with the upper mods - its a fire control issue - something is out of spec or over worn causing the hammer to not properly hand off from disco to sear. Have a trigger job done? Using an adjustable trigger?


    With what you're describing your rifle will double upon resetting the trigger if you fire it. Get it fixed before taking it to the range - have the fire control group inspected.
    Last edited by Dutchy556; 08-21-10 at 14:07.

  5. #5
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    If you separate your upper and lower you can look at your fire control group in better detail. If you SLOWLY release the hammer you will see a a small hook on top of the trigger. This is a small piece of stamped steel. When you hold the trigger down it will engage the hammer and stop the hammer from going forward. I am willing to bet the hook is sheared.

    Who made your trigger group?

    I would order a new trigger ASAP.
    "Oh, its a wonderful day! My sun is shining, my birds are chirping, my humongous chicken defeated Elmo." Huxley

  6. #6
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    Guys, thanks for the quick replies. It is a stock LMT lower it has never been fired by me. I am sure LMT fired it. It has a standard GI trigger. I only mentioned the upper so every one had a complete picture.

    There is a Phase5 bolt catch in the lower the standard cath was replaced.

    I just took a few photos. I need to get to my lap top to upload them.
    "Real men have always needed to know what time it is so they are at the airfield on time, pumping rounds into savages at the right time, etc. Being able to see such in the dark while light weights were comfy in bed without using a light required luminous material." -Originally Posted by ramairthree

  7. #7
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    Here are three close up photos. I tried again to do a functions check. It did not do it every time with the upper off the lower. With the gun put together it did it fifteen times in a row.





    "Real men have always needed to know what time it is so they are at the airfield on time, pumping rounds into savages at the right time, etc. Being able to see such in the dark while light weights were comfy in bed without using a light required luminous material." -Originally Posted by ramairthree

  8. #8
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    unfortunately, you seem to have the type of bad luck i have. this could be any number of things, since you say it's unfired. could be something out of spec between the hammer and trigger sear points- one or both being too short, could be one or both of your pin holes are in the wrong spots. you could try replacing the FCG, but i think the lower should probably go back to LMT.

  9. #9
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    Do you have a spare FCG you can plop in and troubleshoot with? If not I would contact LMT on phone and let them handle it. Doubling is not a good thing

  10. #10
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    Check the dis-connector spring and make sure it's installed properly. That is the usual suspect I start with for this type of problem; especially if it's a new unfired build.

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