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Thread: KAC SR-16 Pressure Reduction System

  1. #121
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    Quote Originally Posted by rapomstage3 View Post
    I only brought up the a5 in here because it directly relates to the topic. Kind of. I looked into doing this awhile back and I remember being told that the ports are the same. That kind of sucks. I assume it would be bigger on a factory 14.5"?
    The thread with jack's comment was in a different thread. Here it is: https://www.m4carbine.net/showthread...1-to-14-5-quot
    Not sure who knows the size, but my guess would be that ayan at boltcarrier.com knows. He's disassembled/assembled plenty of them.

  2. #122
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    You can run an A5H0 on newer larger port SR-15s cut to 14.5" without touching the port. You can mix and match weights to make a A5H0.5 that should work as well. The A5H1 can be too much for reliable cycling. Even though that works, I prefer to open the port now on 16" and cut down to 14.5" to use the A5H2 and a Colt rifle spring. From my testing, I believe that porting for the A5H2 is more reliable than porting for the lighter buffers. Porting for the heavier buffers can be reliable, but can add some "wobble" to the rifle as it cycles. Obviously, shorter and lighter rifles would tend to wobble more than longer and heavier rifles, so those can benefit well with the heavier buffers.

  3. #123
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    Anyone crazy enough to run an LMT enhanced carrier and A5 on an SR-15 in either 16" or SBR configuration?

  4. #124
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    Yes, read throughout this thread. Works pretty well when it's weighted and sprung appropriately. Different setups use different ones.

  5. #125
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    Quote Originally Posted by tom12.7 View Post
    I like the A5 in the KAC 14.5" and 11.5". The A5H3 proved to be too much of a good thing in winter though. They cycled without a can, but didn't catch the bolt stop about a third of the time. Both ran like a champ in the cold with the A5h2. Ironically, the supplied H2 carbine buffer was too much for the extended gas 14.5", but ran like a champ with the A5H2. 13.7" Noveske barrels ( no pig) do the same in the cold as the KAC 14.5". In the summer the difference between the feel of the A5H2 and A5H3 aren't much, so I leave the 2 in unless I knows the cans are staying on for the shoot, then they're A5H4s with Sprinco green to give it some zip back.
    Overall, I think the A5 kit helps out reliability and smoothness. It doesn't cycle as snappy as the carbine system, so it may not be for everyone's taste.

    ok i know off topic, but can someone please explain to me what is going on here? if an h2 was too much/short stroking at 4.6oz, how is the heavier a5h2 @ 5.33oz cycling? i have been researching this topic and best i can find is the rifle spring has more coils and more consistent force. is that the primary explanation? what other forces are at work? i really dont want to switch all my re's out..

    thanks!

  6. #126
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    Actually, yes that is part of the balance between spring and total reciprocating weight.

  7. #127
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    Quote Originally Posted by tom12.7 View Post
    Actually, yes that is part of the balance between spring and total reciprocating weight.
    the rifle spring is at least as strong as a carbine spring, right? unless the pound rate for these 2 springs are different in the example given, i don't see how the longer re and buffer could account for such a large difference in buffer weight?

    edit: ive read the a5 system mimics the travel distance of the rifle setup. is this not also true of the carbine buffer and RE?
    Last edited by t15; 09-07-14 at 22:17.

  8. #128
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    Travel distance is the same. The characteristics of acceleration, average velocities, and deceleration differ between the carbine type action system and the rifle type action system.

  9. #129
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    Quote Originally Posted by tom12.7 View Post
    My KAC 11.5s, 14.5s and 16s are some of the best running 5.56 guns I have.
    The A5 buffer of correct weight helps reliability, especially throwing a suppressor in the mix. The LMT enhanced carrier with the A5 really helps on the carbines that get a can on them even more.
    Ok so I went back and read this thread in it's entirety, interesting info. Perhaps I missed it, but you are running a LMT E-carrier/A5 combo with the 16" KAC correct? What buffer/spring combo have you found works best on the 16"?

  10. #130
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    Start with a Colt rifle spring and an A5H1 buffer. You can tune it some more after that, you may end up with the standard A5H2 buffer.

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