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

  1. #91
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    My 11.5" upper ran great suppressed once I offset the gas issue with the A5 system... Don't get pissy with me because KAC makes their commercial stuff to a different spec then their mil line. It's just the hand we are dealt from the powers that be... I expected a little more for the $$$ I spent.
    Last edited by E-man930; 12-05-12 at 20:08.

  2. #92
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    Everyone ratchet this down a little the issue is being addressed and there is no need to piss all over each other.



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  3. #93
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    Quote Originally Posted by E-man930 View Post
    My 11.5" upper ran great suppressed once I offset the gas issue with the A5 system... Don't get pissy with me because KAC makes their commercial stuff to a different spec then their mil line. It's just the hand we are dealt from the powers that be... I expected a little more for the $$$ I spent.
    So E-Man...should I expect problems when I shoot the KAC SBR upper? I have a SR-15 lower and was planning on just installing the buffer that came with the upper.

  4. #94
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    Like I said, this upper ran like a sewing machine for me until I suppressed it. Then it required a heavier buffer to slow things down, if you read the whole thread you will see my progress with it. The Vltor A5 system with their A5H3 buffer and a green SpringCo rifle spring enabled it to run like a sewing machine suppressed and unsuppressed. If you plan on using a SDN-6 with this upper, I would recommend the A5 system.

  5. #95
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    Ferris2son,
    I am sure the Vltor A5 system is nice kit (I have no experience with it). Before you spend a bunch of extra $, I would run your set up and see what happens. If you have issues there are options and there is plenty of info in this thread. Below is my solution to this problem a detailed earlier in this thread. For what its worth, I have also fired over 1500 rds through my 11.5" KAC upper on a registered M16 lower w/ H3 standard carbine buffer sping combo, suppressed (KAC QDSS NT4) with Zero issues.


    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.

  6. #96
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    Quote Originally Posted by E-man930 View Post
    Like I said, this upper ran like a sewing machine for me until I suppressed it. Then it required a heavier buffer to slow things down, if you read the whole thread you will see my progress with it. The Vltor A5 system with their A5H3 buffer and a green SpringCo rifle spring enabled it to run like a sewing machine suppressed and unsuppressed. If you plan on using a SDN-6 with this upper, I would recommend the A5 system.
    I'm teasing the E-Man.

    My only SBR lower (DDLES) has the A5 system. I've had problems with my 16" SR-15 like those described in the thread. It's picky. I haven't put an A5 on the KAC lower yet. I probably will when it's Form 1 clears.

  7. #97
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    Quote Originally Posted by Ferris2son View Post
    I'm teasing the E-Man.

    My only SBR lower (DDLES) has the A5 system. I've had problems with my 16" SR-15 like those described in the thread. It's picky. I haven't put an A5 on the KAC lower yet. I probably will when it's Form 1 clears.


    For those who don't know, Ferris2son bought my 11.5" upper so that I could afford KAC's 14.5" upper (without the wife making me go live on Gabuzz's couch). Rock on man, post your results in this thread if you get anything different than what I experienced. Actually, post here either way to keep everyone informed...
    Last edited by E-man930; 12-08-12 at 11:53.

  8. #98
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    Quote Originally Posted by Ferris2son View Post
    I'm teasing the E-Man.

    My only SBR lower (DDLES) has the A5 system. I've had problems with my 16" SR-15 like those described in the thread. It's picky. I haven't put an A5 on the KAC lower yet. I probably will when it's Form 1 clears.
    Please define "picky" regarding your 16" upper. What ammo, buffer setup or any other factors you changed compared to the factory recommended configuration?

  9. #99
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    Ditto, please share the details about your 16" KAC gun, and weather or not it is an early (small gas port) or later gun (gas port enlarged to cycle .223 bulk ammo)...

  10. #100
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    I've owned both the small and enlarged port SR15's. The only issue I ever had was with some very weak Centurion brass and Wolf. Granted, I don't own a suppressor either, which is what started this particular thread.

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