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Thread: Trigger not resetting with suppressor.

  1. #1
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    Trigger not resetting with suppressor.

    I am having an issue with my trigger not resetting when shooting suppressed. It is on a 10.5" AR with an M4-2000. I was having overgasing issues with an H2 buffer. The bolt was not locking back on the last round and it was jamming the next round half way into the chamber, so I went to an H3 buffer. I put about 100 rounds through it today unsuppressed, and had no issues with Wolf and XM193 with the H3. The bolt locks back on last round and no misfeeds. When suppressed every few rounds the trigger will not reset. The round is in the camber and bolt is fully closed. I built the gun using all parts from Noveske including the barrel. The gun has ~3000 rounds through it. Any ideas on what I can do to remedy this?

    Jeremy
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    Disconnector spring bad, bent, or misaligned???

    Open the gun and push on the disconnector tail to see if it moves correctly against the spring's tension.
    "You people have too much time on your hands." - scottryan

  3. #3
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    IMO If the bolt was not locking back and jamming the next round, it was short stroking. Try a H buffer. Maybe want to check the gas key to make sure that it didn't get loose. But I am no expert.

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    So wait, it's feeding the next round, but not resetting the trigger? If you manually cock it, does it then reset? Try doing a functions check over and over and see if you can get it to not reset.

    I'll put it this way, the bolt only needs to cycle about half as far to reset the trigger as it needs to feed a new round, so the problem isn't it being over or under gassed. What sort of trigger mechanism are you working with? Standard semi auto?
    Last edited by Brian1/75; 09-21-11 at 12:43.

  5. #5
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    Quote Originally Posted by markm View Post
    Disconnector spring bad, bent, or misaligned???

    Open the gun and push on the disconnector tail to see if it moves correctly against the spring's tension.
    Disconnector movement seems fine, but gritty. I took the trigger group out to inspect it. I noticed a shinny spot right above and just foreward of where the spring is. The tail of the hammer is hitting the disconnector. I am not sure if this is normal. My other AR has a Giesselle SSA-E and it is a different set up. I do have a spair CMT trigger group that I will try on my next outting. I compaired the two disconnectors, and the one in my gun was quite rough looking and was thicker. The one in the gun measured .123 and my spair was .118 and had a nicer finish.

    Quote Originally Posted by sdw308 View Post
    IMO If the bolt was not locking back and jamming the next round, it was short stroking. Try a H buffer. Maybe want to check the gas key to make sure that it didn't get loose. But I am no expert.
    Gas key is properly staked and tight. I had this problem with an H and an H2, that is why I went to the H3. It only happens when suppressed. No jams with the H3 though.

    Quote Originally Posted by Brian1/75 View Post
    So wait, it's feeding the next round, but not resetting the trigger? If you manually cock it, does it then reset? Try doing a functions check over and over and see if you can get it to not reset.
    Yes. That is what I don't understand. When I pull the charge handle it ejects the live round and will reset the trigger. It is a semi CMT trigger. I am leaning that it is a trigger issue too.

    The gun is well lubed with Slip 2000.

    Jeremy
    Last edited by J Krammes; 09-21-11 at 12:49.
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    Quote Originally Posted by J Krammes View Post
    Disconnector movement seems fine, but gritty. I took the trigger group out to inspect it. I noticed a shinny spot right above and just foreward of where the spring is. The tail of the hammer is hitting the disconnector. I am not sure if this is normal. .
    That's normal wear. Which is to say it is wear. Next time it doesn't reset pop your lower off and see if the hammer is actually locked back. I'd think it'd go full auto if the disconnect wasn't catching the hammer anymore, but maybe not. And usually the weapon starts double-firing long before it goes full auto. It still doesn't make sense that it's only when its suppressed.
    Last edited by Brian1/75; 09-21-11 at 12:56.

  7. #7
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    Doubling/Tripling/whatever may not happen if the hammer is riding the carrier forward. Running suppressed means you're getting a lot more gas and maybe the extra speed of the BCG is causing problems. (similar to how and over-gassed gun's BCG can outrun the mag follower or bolt catch).

    The first thing I would try is a new disconnector and spring. After that, perhaps a sprinco blue or maybe even red buffer spring. Know anyone with the A5 setup?

    Quote Originally Posted by Brian1/75 View Post
    That's normal wear. Which is to say it is wear. Next time it doesn't reset pop your lower off and see if the hammer is actually locked back. I'd think it'd go full auto if the disconnect wasn't catching the hammer anymore, but maybe not. And usually the weapon starts double-firing long before it goes full auto. It still doesn't make sense that it's only when its suppressed.
    Last edited by Eric D.; 09-21-11 at 14:02.
    B.A.S. Mechanical Engineering Technology

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    Quote Originally Posted by Brian1/75 View Post
    So wait, it's feeding the next round, but not resetting the trigger? If you manually cock it, does it then reset? Try doing a functions check over and over and see if you can get it to not reset.

    I'll put it this way, the bolt only needs to cycle about half as far to reset the trigger as it needs to feed a new round, so the problem isn't it being over or under gassed. What sort of trigger mechanism are you working with? Standard semi auto?

    That explains where to look...

  9. #9
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    A live round in the chamber with the hammer forward sounds alot like bolt bounce to me. If I read correctly you say it happens occasionally when suppressed and when unsuppressed it shoots fine. Since the suppressor increases back pressure this sounds like the problem.



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  10. #10
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    Try the LMT enchanced CARRIER only and not the bolt, it will blead off some of the excess gas.

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