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Thread: KAC SR-15 14.5" Ejection

  1. #1
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    KAC SR-15 14.5" Ejection

    Let me preface my query by stating that I realize ejection patterns are not the end-all, be-all when it comes rifle function, and that unless my rifle is not functioning properly, then I shouldn't worry about ejection patterns. That being said, the rifle in question has functioned reliably thus far.

    Today I brought my KAC SR-15 14.5" w/ KAC buffer and BCM Mid-length 14.5" w/ H buffer to the range, and ran 55gr 5.56 PPU through both.

    I noticed that the BCM ejected brass strongly and consistently at 4:00-4:30, while the KAC seemed to have a weaker and more erratic ejection pattern.

    I'm sure this boils down to gas length differences (not sure if KAC still uses intermediate gas) and buffer weights (don't know the weight of a KAC buffer), but I'm looking for more insight...

  2. #2
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    My first upper from KAC ejected all over the place. So much so that it left brass marks on the rail.
    It also would fail to eject sometimes. Turns out the gas port was to big and the buffer spring was to short from the factory.

  3. #3
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    When was the SR15 produced?
    Complete rifle or upper from factory?

    Sent from my VS980 4G using Tapatalk
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  4. #4
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    Quote Originally Posted by Failure2Stop View Post
    When was the SR15 produced?
    Complete rifle or upper from factory?

    Sent from my VS980 4G using Tapatalk
    I'm presuming 2013. How can I find out for sure?

    Factory upper on a factory KAC lower from a Mod 1.

  5. #5
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    What's the S/N range?
    KAXXX is all I need.

    Sent from my VS980 4G using Tapatalk
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  6. #6
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    Quote Originally Posted by Failure2Stop View Post
    What's the S/N range?
    KAXXX is all I need.

    Sent from my VS980 4G using Tapatalk

    Where would I find a serial on the upper?

  7. #7
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    Ah, misunderstanding on my part. Understood that it is not a factory 14.5.

    Recommend a 2H buffer.

    Sent from my VS980 4G using Tapatalk
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  8. #8
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    Also, recommend checking/cleaning/lubricating the ejector and extractor.
    Does your extractor have a dot on the reinforcing lug?

    Sent from my VS980 4G using Tapatalk
    Jack Leuba
    Director, Military and Government Sales
    Knight's Armament Company
    jleuba@knightarmco.com

  9. #9
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    Quote Originally Posted by Failure2Stop View Post
    Ah, misunderstanding on my part. Understood that it is not a factory 14.5.

    Recommend a 2H buffer.

    Sent from my VS980 4G using Tapatalk

    Thank you, sir. I will try that tomorrow. Actually had an H2 with me.

    Is the factory KAC an H?
    Last edited by scooter22; 01-11-14 at 20:15.

  10. #10
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    Quote Originally Posted by scooter22 View Post
    Thank you, sir. I will try that tomorrow. Actually had a 2H with me.

    Is the factory KAC an H?
    They come with an HH (H2).

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