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Thread: Need 6.8 SBR port size advice

  1. #1
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    Need 6.8 SBR port size advice

    Looking to get this 12.5 barrel for a 6.8 SPC build.: https://www.ar15performance.com/inc/sdetail/7500

    They will do whatever port size I request. I plan on running cheap S&B and Prvi Partizan for plinking and Hornady SST 120 grain for defense. Suppressed reliability without an adjustible gas block is first priority, but ideally would cycle w/o can also.

    What port size do you recommend to be sure of cycling with a can and at least have a shot of cycling the defense ammo without?

    Also, what weight buffer with Vltor A5 tube? I use H3 & 4 with my 5.56 shorties.
    "In our own case we accept excuses too easily; in other people's, we do not accept them easily enough." - C.S. LewIs

  2. #2
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    12.5" Mid in 6.8?

    .093" seems about right
    Last edited by Clint; 11-03-18 at 06:39.
    Black River Tactical
    BRT OPTIMUM Barrels - 16" MPR, 11.5" CQB, 9" PDW
    BRT OPTIMUM-S Barrel - 11.5" CQB Suppressor Gas Drive
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT and PDW Lengths
    BRT EZTUNE Gas Tubes - CAR and MID
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  3. #3
    Join Date
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    Thanks Clint. Yours is the opinion I most hoped to hear.

    And big thanks for referencing the SGAmmo Barnaul mil-spec 5.56 in another thread. That cheap stuff seems almost as good as MEN and better than Wolf Gold in all my ARs with or without a suppressor.
    "In our own case we accept excuses too easily; in other people's, we do not accept them easily enough." - C.S. LewIs

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