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Thread: 10.5" Issues

  1. #11
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    I think I can help narrow down the op's problem. I'm interested in this as well. I have had identical problems with my 10.5 and a sd3g trigger. I actually moved the trigger to another rifle and replaced it with a s3g. This made it better, but I am still having the reset issue. Fwiw, I know my doubling was due to bump fire, but the failure to reset makes me crazy.
    I know Geissele will give me a heavier spring set, but won't that make my trigger feel heavier? I bought these triggers because I wanted light and short.
    I have a factory DD mk-18, 10.3". I use the original bolt carrier and a h2 buffer. My suppressor is also an AAC m4-2000.

  2. #12
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    Looks like I was typing as the oP was hitting enter. Perhaps we have different problems with similar symptoms.
    I have. Noticed that I am more likely to have the failure to reset problem when I'm trying to fire fast multiples. It may happen 2/3 time in a mag if I am shooting fast.

  3. #13
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    Quote Originally Posted by Breadman View Post
    I think I can help narrow down the op's problem. I'm interested in this as well. I have had identical problems with my 10.5 and a sd3g trigger. I actually moved the trigger to another rifle and replaced it with a s3g. This made it better, but I am still having the reset issue. Fwiw, I know my doubling was due to bump fire, but the failure to reset makes me crazy.
    I know Geissele will give me a heavier spring set, but won't that make my trigger feel heavier? I bought these triggers because I wanted light and short.
    I have a factory DD mk-18, 10.3". I use the original bolt carrier and a h2 buffer. My suppressor is also an AAC m4-2000.
    My money for this is the H2 buffer slowing the carrier down too much when you don't have the back-pressure from the suppressor. The bolt is short-stroking and not pushing the hammer back far enough for it to catch on the disconnector. Try going back to the "H" buffer that came in the gun from the factory and see if that fixes it.

    (FWIW, I also have a factory DD MK18). My buddy (Karmapolice on here) has a factory DD MK18 upper on a KAC lower. He was experiencing short-stroking that caused failures to eject when running an H2 in his lower. Switching back to the H buffer cured it.
    Last edited by ASH556; 08-20-12 at 17:30.
    Semper Paratus Certified AR15 Armorer

  4. #14
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    Quote Originally Posted by Shalashaska View Post
    Well you guys that said it was the BCG were right.

    I went to the range today after throwing in the Noveske BCG and the gun ran like a champ both suppressed and unsuppressed. I only had time to burn 100 rounds but I didn't have a single problem, whereas before I couldn't get through a 20rd mag without one or two issues.

    I did not try running the other bolt in the Noveske carrier or vice versa (mostly because I was pressed for time). So I'm still not sure what's out of spec but I'll contact Core15 and see if they want it back to inspect or something. I've read that they have some pretty good customer service.

    Anyway, hopefully this was truly the problem and I can get on with enjoying my rifle. Thanks to everyone for the help/suggestions.
    Just see if you can get your money back on that Core15 junk and drive on. Obviously something is made out of spec. Not worth the hassle now that you've got the gun working.
    Last edited by ASH556; 08-20-12 at 17:26.
    Semper Paratus Certified AR15 Armorer

  5. #15
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    Quote Originally Posted by ASH556 View Post
    My money for this is the H2 buffer slowing the carrier down too much when you don't have the back-pressure from the suppressor. The bolt is short-stroking and not pushing the hammer back far enough for it to catch on the disconnector. Try going back to the "H" buffer that came in the gun from the factory and see if that fixes it.

    (FWIW, I also have a factory DD MK18). My buddy (Karmapolice on here) has a factory upper on a KAC lower. He was experiencing short-stroking that caused failures to eject when running an H2 in his lower. Switching back to the H buffer cured it.
    Its worth a shot. All the failure to reset issue for me happen while shooting suppressed.
    Unsuppressed the only problem I have is paying attention to my trigger control to avoid unintended bumpfire.

  6. #16
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    When the hammer doesn't "reset", do you have a live round in the chamber?

  7. #17
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    Yes there is a live round in the chamber when this happens.

  8. #18
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    Quote Originally Posted by ASH556 View Post
    My money for this is the H2 buffer slowing the carrier down too much when you don't have the back-pressure from the suppressor. The bolt is short-stroking and not pushing the hammer back far enough for it to catch on the disconnector. Try going back to the "H" buffer that came in the gun from the factory and see if that fixes it.
    Can the gun short stroke enough to chamber another round but not reset the hammer?

  9. #19
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    With a live round in the chamber, it sounds like a bolt bounce issue.



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  10. #20
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    Quote Originally Posted by ASH556 View Post
    My money for this is the H2 buffer slowing the carrier down too much when you don't have the back-pressure from the suppressor. The bolt is short-stroking and not pushing the hammer back far enough for it to catch on the disconnector. Try going back to the "H" buffer that came in the gun from the factory and see if that fixes it.

    (FWIW, I also have a factory DD MK18). My buddy (Karmapolice on here) has a factory DD MK18 upper on a KAC lower. He was experiencing short-stroking that caused failures to eject when running an H2 in his lower. Switching back to the H buffer cured it.
    IIRC, the DD MK18's have smaller gas ports (< .060")and that could be the reason why they don't run so well with the H2 and heavier buffers.

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