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Thread: Long Time AR Builder, First Time AR9 Builder

  1. #11
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    And this is the buffer you want... https://www.joeboboutfitters.com/KVP...7.5-9mm-ss.htm

  2. #12
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    Long Time AR Builder, First Time AR9 Builder

    Thanks guys

    So the KAK buffer is light and according to 40+ reviews on Joe Bobs, works great with a 308 spring and the spacer.

    The KVP buffer is heavier and extended. It works flawlessly with the high power spring.

    I'm sticking with the KAK to save weight. My barrel is lightweight as is the rail.


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    Last edited by AlphaTango23; 03-19-17 at 23:22.
    OIF Vet | 0331

  3. #13
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    Quote Originally Posted by AlphaTango23 View Post
    Thanks guys

    So the KAK buffer is light and according to 40+ reviews on Joe Bobs, works great with a 308 spring and the spacer.

    The KVP buffer is heavier and extended. It works flawlessly with the high power spring.

    I'm sticking with the KAK to save weight. My barrel is lightweight as is the rail.


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    If you're going to be using factory loads, I'd run the heavy 9mm buffer and 308 spring. That's the setup I use in mine, and I'm using handloaded gamer loads at 125pf. You have to remember that the blowback system has no bolt lock-up, it headspaces on the taper of the case and that's it. The more mass in the operating system you have, the more dwell time you'll get, and the lower your chances of an out-of-battery discharge. Dot movement on my PCC is minimal, and light carbines are overrated, especially in a blowback gun where extra weight will help soak up felt recoil.

  4. #14
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    Quote Originally Posted by RIGPIG View Post
    If you're going to be using factory loads, I'd run the heavy 9mm buffer and 308 spring. That's the setup I use in mine, and I'm using handloaded gamer loads at 125pf. You have to remember that the blowback system has no bolt lock-up, it headspaces on the taper of the case and that's it. The more mass in the operating system you have, the more dwell time you'll get, and the lower your chances of an out-of-battery discharge. Dot movement on my PCC is minimal, and light carbines are overrated, especially in a blowback gun where extra weight will help soak up felt recoil.
    Thanks for the info!
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  5. #15
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    17359286_10208472249659959_1438230148835398434_o.jpg

    Got the upper assembled. I am really impressed with Kaw Valley Konza rail. I have a BCM KMR on another AR that was an absolute bish to install. I had to heat it and hammer the crap out of it to fit. This Konza rail is very light weight, fits perfectly, and seems well made.
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  6. #16
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    There are several buffer/spring combinations you can use with a 9mm AR. One I have found that works very well is a Rifle action spring and A5 buffer in a standard RE. The longer A5 buffer is a similar length to the dedicated 9mm options, and the A5H4 I currently am using has been flawless. I have also build one using the KAK extended 9mm buffer, and it has also worked well.

  7. #17
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    Any buffer/ spring changes need to be made to run a pistol tube?


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  8. #18
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    17426281_10208554804443777_2200218877099450542_n.jpg17553644_10208554800643682_7871868479636925958_n.jpg17629861_10208554799523654_9212797392324688537_n.jpg17553503_10208554799123644_4480020772663334100_n.jpg

    Got it built! Hitting the range tomorrow.

    I am very impressed with the quality of the PSA lower. PSA gets shit on a bit here, but for the money it seems fantastic.

    It came with a trigger in-correctly installed. I took it out and reinstalled it. It feels TERRIBLE. I'm going to test it at the range tomorrow, and then drop in a Geissele.
    Last edited by AlphaTango23; 03-31-17 at 21:31.
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