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Thread: Knight's Armament SR-15 E3 Legacy 16" & SR-15 E3 CQB SBR 11.5" malfunction suppressed

  1. #11
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    Do you have any suggestions for a buffer/spring combination for the 16" sr15? As mentioned in the thread, I would like to have a setup was that would able to reliably cycle 5.56 ammo suppressed and unsuppressed.

  2. #12
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    Quote Originally Posted by gabuzz12 View Post
    Do you have any suggestions for a buffer/spring combination for the 16" sr15? As mentioned in the thread, I would like to have a setup was that would able to reliably cycle 5.56 ammo suppressed and unsuppressed.
    Without being a smartass, the A5 system is the most forgiving. Your best bet would be an A5 on the 16" as well.

    Vltor also offers lighter-than-std buffers as well.
    Last edited by BufordTJustice; 07-15-12 at 17:37.

  3. #13
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    BufordTJustice,

    The newer KAC rifles come with a new style block that is double pinned instead of pressed on like they used to; I'm pretty sure I can get it off but the question is why would I want to remove the gas block?
    Last edited by E-man930; 07-15-12 at 17:41.

  4. #14
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    I started researching the A5 system and came across this thread on m4c where a member was having issues with it on their kac. See below

    https://www.m4carbine.net/showthread.php?t=75665
    Last edited by gabuzz12; 07-15-12 at 17:52.

  5. #15
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    Quote Originally Posted by E-man930 View Post
    BufordTJustice,

    The newer KAC rifles come with a new style block that is double pinned instead of pressed on like they used to; I'm pretty sure I can get it off but the question is why would I want to remove the gas block?
    I'm sorry. I stand corrected on both counts. I thought you were using the older block and that you were the one who mentioned possibly using a Noveske SwitchBlock. Disregard my previous comment.

  6. #16
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    10-4 - I would love to use a switch-block from Noveske but it's too large to fit under the URX2. As long as I can iron out my carbine so it's 100% suppressed I'm happy.
    Although I would love to see KAC make a switch block that fits under their URX series rails; I wouldn't be wading through this mess right now if they did. Frankly, I'm not impressed that my 11.5" upper is so over-gassed when run suppressed and wonder why the compromise from KAC on the gas port size.
    Last edited by E-man930; 07-15-12 at 18:01.

  7. #17
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    it may be worth trying, a new/different ejector spring in your bolt. I know you diagnosed over gasing, but a stronger/faster spring might get that brass out of there a bit quicker. just a cheap idea.

    however unlikely it is where i would start diagnosing the problem first. I do not know how far away from Newnan Ga you are but the ar bunker may have some in stock.
    Last edited by majorleaguekennels; 07-15-12 at 19:48.

  8. #18
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    I doubt they are bad on both rifles but your suggestion does make sense. I'm sure KAC uses a decent quality ejector spring and I don't think anyone makes a stronger one.
    (I have a few Colt ejector spring spares new in bag that I can access if I need them)
    I'll try the H3 this coming week and see where I'll go from there. I will report back once the H3 is in the gun...
    Last edited by E-man930; 07-15-12 at 21:50.

  9. #19
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    KAC has been contacted and is looking into the matter further. Guns should not be choking this hard when run suppressed... Will update thread as things progress.

  10. #20
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    I had the exact same problem (over gassed when running a can) on 2 different KAC SR15s one factory SBR one standard 16". I tried switching out the factory buffers with H2 and H3 but still had issues. I ran both uppers supressed on a stock Colt 6933 lower with H3 buffer and they ran 100%. This lead me to the theory that the factory KAC buffer spring must be a "light" spring. I switched the KAC factoy springs in both lowers to new standard carbine replacement springs (had them in my spares kit) and changed to H3 buffers. Both work 100% suppressed and unsupressed.

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