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Thread: Tubbs flatwire vs stock A5 spring?

  1. #1
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    Tubbs flatwire vs stock A5 spring?

    Long story short:

    4 complete Colt 6920s had the LE lowers sold to collectors, lowers were replaced with SOLGW and one Geissele lower, all with A5 kits, stock springs and A5-2 buffers.

    Several malfunctions observed, all incomplete fail to feeds when charged with the handle or from an open bolt using the bolt release.

    These rifles, mags, ammo, and lube have all been extensively vetted with the carbine/H2 Colt lowers and reliable for years, there is no issue with the uppers. There is no issue with the lowers, they have inspected and everything is as it should be.

    Sprinco springs won’t be considered as corrosion has been an issue in the past with those (saltwater/air environment).

    Tubbs flatwire springs are about all I’m considering at the moment because they’re stainless and I like the idea of more coils (why I liked the A5 too).

  2. #2
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    My guess is that you have too much buffer weight.

  3. #3
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    Quote Originally Posted by georgeib View Post
    My guess is that you have too much buffer weight.
    It’s the stock A5 buffer that equals the rifle buffer.

  4. #4
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    Quote Originally Posted by 17K View Post
    It’s the stock A5 buffer that equals the rifle buffer.
    Right. Which IIRC is ~5.3 oz, which is 2.3 oz heavier than the 3.0 oz H buffer in the 6920.

  5. #5
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    I've always preferred the Sprinco Green, though I do have one tubbs. No problems I can recall.

    Edit-I find the Sprincos to be consistent from spring to spring, and have felt variances with other "stock" springs. I also felt like the stock A5 springs were kind of soft, but maybe that's just me.
    Last edited by opngrnd; 08-22-21 at 10:39.

  6. #6
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    Quote Originally Posted by georgeib View Post
    Right. Which IIRC is ~5.3 oz, which is 2.3 oz heavier than the 3.0 oz H buffer in the 6920.

    Which is not directly comparable since we’re talking carbine vs rifle springs. I ran H2 buffers in the Colt lowers.

  7. #7
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    There is probably a reason BCM shipped their A5 kit with the "0" buffers.

  8. #8
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    Maybe a silly question, but are you sure you have rifle springs? The rifle springs have more preload than carbine springs and should chamber more reliably.

  9. #9
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    You know, I didn't read the OP thoroughly and missed the part where it was only happening when charged or released. Please disregard my dumb comments.

  10. #10
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    Double check the spring lengths.

    The A5 tends to work best with spring tension at the high end of range.

    Shoot for at least 12.5"

    From:
    TECHNICAL MANUAL
    ARMY NO. 9-1005-319-23&P

    RIFLE:
    11 3/4 Inches minimum
    to
    13 1/2 inches maximum
    Black River Tactical
    BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
    BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
    BRT Bolt Carrier Groups M4A1, M16 CHROME
    BRT Covert Comps 5.56, 6X, 7.62

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