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Thread: Using an A5 on a 20" upper

  1. #11
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    Finally got through to Fulton and their armorer said the port size was .099"

    Decided to go with the barrel McKay Enterprises has:

    http://store.mckay-ent.com/ar15-m16/...nt-barrel.html
    Last edited by ABNAK; 12-02-14 at 20:15.
    11C2P '83-'87
    Airborne Infantry

  2. #12
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    Quote Originally Posted by ABNAK View Post
    Finally got through to Fulton and their armorer said the port size was .099"

    Decided to go with the barrel McKay Enterprises has:

    http://store.mckay-ent.com/ar15-m16/...nt-barrel.html
    I used one of those on a recent build, it's been great.
    Ken in Illinois

  3. #13
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    Whoa.

    At least they actually told you the size.

    Quote Originally Posted by ABNAK View Post
    Finally got through to Fulton and their armorer said the port size was .099"

    Decided to go with the barrel McKay Enterprises has:

    http://store.mckay-ent.com/ar15-m16/...nt-barrel.html
    Black River Tactical
    BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
    BRT EZTUNE Preset Gas Tubes - CAR and MID
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  4. #14
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    Quote Originally Posted by markm View Post
    Exactly. But as pointed out... God knows what Fulton is porting the barrel at.
    Yeah, but at basically 0.1" at the gas port, I don't think we've found that unicorn yet that won't run an A5 configuration (that will run with something else).
    عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
    کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
    Semper Fi
    "Being able to do the basics, on demand, takes practice. " - Sinister

  5. #15
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    Good call on the barrel. Unless it's going on a match gun, I'd rather have a 5.56 chamber than CBI's "hybrid match" chamber. Thanks for posting that barrel -- it's good to have more options for an A1 profile CL 1/7 twist barrel.
    "This motto may adorn their tombs
    (Let tyrants come and view):
    We rather seek these silent rooms
    Than live as slaves to you."

    Lemuel Haynes, 1775

  6. #16
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    How much does that A1 barrel weigh?

    Quote Originally Posted by ABNAK View Post
    Decided to go with the barrel McKay Enterprises has:

    http://store.mckay-ent.com/ar15-m16/...nt-barrel.html
    Black River Tactical
    BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
    BRT EZTUNE Preset Gas Tubes - CAR and MID
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  7. #17
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    Quote Originally Posted by Clint View Post
    How much does that A1 barrel weigh?
    It shipped yesterday. I had one of those very same barrels from McKay a year or two ago (could kick myself for getting rid of that upper!) and it is indeed an A1 profile. Rumor has it they are IDF contract overruns but who knows.

    Going to use the PRI rifle-length black carbon fiber FF handguard, A5 buffer kit, Choate collapsible stock (I like them), BCM upper I already have, and slap an Aimpoint Pro on it. Of course it has to go to Adco first for the FSB installation. Might even put a 3-prong M16 FH on that bad boy!
    11C2P '83-'87
    Airborne Infantry

  8. #18
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    Quote Originally Posted by ABNAK View Post
    Since the A5 is *essentially* a rifle-length buffer tube I was wondering what a good spring/buffer combo for the 20" pressures and velocities would be.

    just for the sake of correctness, the A5 tube is NOT "essentially" a rifle buffer tube. its in between the carbine and rifle and the A5 buffer is designed to only work with the A5 tube.

    the only component of the A5 system that is the same as anything is the buffer spring, its a rifle spring.
    Last edited by mr h; 12-10-14 at 10:24.

  9. #19
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    Quote Originally Posted by TehLlama View Post
    Yeah, but at basically 0.1" at the gas port, I don't think we've found that unicorn yet that won't run an A5 configuration (that will run with something else).
    I'm running an AAC 9" 300BLK Suppressed on an A5 with subsonics.

    If it doesn't work running subs unsuppressed, we will have found it.
    Why do the loudest do the least?

  10. #20
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    I suspect that one is a shetland pony with a waffle taped to it's head.

    If a short barreled unsuppressed rifle being fed subsonics is what defies the A5 a configuration that runs, I'm guessing we're still in good shape making unqualified recommendations for the A5 system; a 10" or shorter barrel being fed ammunition designed to remain subsonic through 16" barrels on a SBR setup that should realistically be suppressed to achieve best results needing some can backpressure... I don't see the use in a setup like that, and I still suspect that an A5H2 would cycle fine with it anyway.
    عندما تصبح الأسلحة محظورة, قد يملكون حظرون عندهم فقط
    کله چی سلاح منع شوی دی، یوازي غلوونکۍ یی به درلود
    Semper Fi
    "Being able to do the basics, on demand, takes practice. " - Sinister

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