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Thread: Trigger not resetting with suppressor.

  1. #21
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    Just curious. Are you saying it can't be bolt bounce? I had the exact same thing happen with some of our Bushmasters. I replaced every single part in the lower receiver (trigger, hammer, disconnector/spring) as well as the buffer spring.

    I even tried different lowers in order to narrow it down. In every single case it continued to happen. I then replaced the barrel with a brand new 14.5" BM barrel and reinstalled the original parts into the weapon. The issue was gone. I fired approx. 10 magazines through it to check it and it worked 100%.

    I'm not saying it can't be something else and I believe that I stated he should try other steps.

    Quote Originally Posted by MK18Pilot View Post
    This thread went to hell in the proverbial hand basket after Markm's post which was the only sound one in the thread. A good opportunity for a lesson in BASIC trouble shooting turned into SWAGfest.

    A failure to disconnect can only involve the parts that live on the hammer and trigger pins. The order of inspection / replacement is disconnector spring, disconnector, hammer then trigger. Your wasting time and money investigating any other option.



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  2. #22
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    Quote Originally Posted by Iraqgunz View Post
    Just curious. Are you saying it can't be bolt bounce? I had the exact same thing happen with some of our Bushmasters. I replaced every single part in the lower receiver (trigger, hammer, disconnector/spring) as well as the buffer spring.

    I even tried different lowers in order to narrow it down. In every single case it continued to happen. I then replaced the barrel with a brand new 14.5" BM barrel and reinstalled the original parts into the weapon. The issue was gone. I fired approx. 10 magazines through it to check it and it worked 100%.

    I'm not saying it can't be something else and I believe that I stated he should try other steps.
    I don't believe bolt bounce has anything to do with a failure to disconnect. That being said, I can't explain your experience. The phenomenon of bolt bounce occurs several steps after the point at which the disconnector is in play during the cycle of operation.

    Counter Recoil Phase
    1. Feed
    2. Chamber
    3. Lock
    4. Fire

    Recoil Phase
    5. Unlock
    6. Extract
    7. Eject
    8. Cock

    It could be argued that cocking takes places before ejection but we'll stick with sequence above.Bolt bounce occurs at Step 2. A failure to disconnect occurs at Step 8. How can it be argued that a failure of Step 2 can cause a failure at Step 8?

  3. #23
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    This is the part that led me to that conclusion per the OP's post.

    When suppressed every few rounds the trigger will not reset. The round is in the camber and bolt is fully closed. So we have a live round in the chamber, the hammer is in the forward position and the bolt carrier is locked into the chamber.

    This is the EXACT issue we had with ours. Again, I would replace the disconnector spring and I would be replacing cheap parts first. But, I think there may be more happening. This is just guess as is most AR surgery over the internet.

    Quote Originally Posted by MK18Pilot View Post
    I don't believe bolt bounce has anything to do with a failure to disconnect. That being said, I can't explain your experience. The phenomenon of bolt bounce occurs several steps after the point at which the disconnector is in play during the cycle of operation.

    Counter Recoil Phase
    1. Feed
    2. Chamber
    3. Lock
    4. Fire

    Recoil Phase
    5. Unlock
    6. Extract
    7. Eject
    8. Cock

    It could be argued that cocking takes places before ejection but we'll stick with sequence above.Bolt bounce occurs at Step 2. A failure to disconnect occurs at Step 8. How can it be argued that a failure of Step 2 can cause a failure at Step 8?



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  4. #24
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    I think MK18 and IraqGunz both of you bring good points.
    I would like to see one of those overgassed bolt bouncing uppers on a cut away lower exposing the FCG with some high speed film.
    I wonder with too high a carrier velocity if the disconnector starts to bounce also??

  5. #25
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    Bolt bounce only explains the failure if he is pulling the trigger for a second shot at the exact time the carrier is unlocked from bounce. It is pretty rarely seen in semi because of the timing.

    To check. Chamber a round and then remove the mag. When you fire, pull the trigger all the way to the rear and don't let it reset (keep it held to the rear). Open the rifle, if the hammer is forward your disconnector is not working.

  6. #26
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    Quote Originally Posted by Todd.K View Post
    Bolt bounce only explains the failure if he is pulling the trigger for a second shot at the exact time the carrier is unlocked from bounce. It is pretty rarely seen in semi because of the timing.

    To check. Chamber a round and then remove the mag. When you fire, pull the trigger all the way to the rear and don't let it reset (keep it held to the rear). Open the rifle, if the hammer is forward your disconnector is not working.
    Can't you do this test with just the lower assembly?

    Unpinn the lower, manually cock the hammer, pull the trigger (ease the hammer foward with your finger), keep the trigger pressed to the rear, cock the hammer again and release your finger. The hammer should stay cocked.

  7. #27
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    Can't do it with just the lower alone unless you can somehow impart with your thumb the same amount of force and thrust on the hammer face that the BCG does when the failure occurs.

  8. #28
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    Jeremy
    Does this happen from the bench or in position?

  9. #29
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    I was standing while shooting. Depending on the weather, I may be able to get out tomorrow and try the new trigger.

    Jk
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  10. #30
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    What did you replace? The whole trigger or just the disconnector spring?

    Quote Originally Posted by J Krammes View Post
    I was standing while shooting. Depending on the weather, I may be able to get out tomorrow and try the new trigger.

    Jk



    Owner/Instructor at Semper Paratus Arms

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