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  1. #1
    Machine Gunner electronman1729's Avatar
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    Default 6.8 SPC - Barrel Length and Twist

    Thinking of getting a 6.8 SPC. Anyone have any good insights?
    What is the optimal performance between barrel twist rate, bullet weight, and barrel length?
    Deplorable millennial born 30 years too late

  2. #2
    High Power Shooter whitewalrus's Avatar
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    What are you using it for? The longer barrels tend to not give it that much more velocity, so I would go 16-18" if you are using for hunting or planning to be mobile with it.

    I haven't played around with mine too much, sticking with bullets around 115 gr

  3. #3
    Machine Gunner electronman1729's Avatar
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    Quote Originally Posted by whitewalrus View Post
    What are you using it for? The longer barrels tend to not give it that much more velocity, so I would go 16-18" if you are using for hunting or planning to be mobile with it.

    I haven't played around with mine too much, sticking with bullets around 115 gr
    Intend to hunt with it. Thinking of using a SBR lower to keep the weight down.
    Deplorable millennial born 30 years too late

  4. #4
    High Power Shooter whitewalrus's Avatar
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    Note that you cannot hunt with SBRs in CO, you can put it on a pistol lower though.

    I haven't used it in anything shorter than 16" myself.

  5. #5
    Machine Gunner Robb's Avatar
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    16" is the shortest barrel you can go in CO for hunting. I checked the regs the other day thinking of building a short AR10.
    Lots of barrel vendors out there but one barrel option to look into is ARPerformance. I have a couple with one in 6.8 and off a bench with a 2 stage trigger both will shoot MOA and under with good ammo and the barrels are a good price. I shoot factory 120gr Hornady 6.8 for hunting and mine is 18". I built it for my son, he wanted to hunt with an AR and he's taken 2 deer and an antelope with it so far.
    I'd like to try the Barnes bullets but havent tried them out yet, pretty happy with the accuracy of the Hornady.

  6. #6
    Machine Gunner electronman1729's Avatar
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    Quote Originally Posted by whitewalrus View Post
    Note that you cannot hunt with SBRs in CO, you can put it on a pistol lower though.

    I haven't used it in anything shorter than 16" myself.
    Guess that one spaced my mind! Any good recommendations on barrels?
    Deplorable millennial born 30 years too late

  7. #7
    High Power Shooter whitewalrus's Avatar
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    Wilson combat, noveske still make 6.8 spc barrels. I don?t even remember who made mine.

  8. #8
    Grand Master Know It All sellersm's Avatar
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    This is what you seek: https://ar15performance.com


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  9. #9
    Varmiteer JohnnyDrama's Avatar
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    I've got a 16 inch barrel with 1/11 twist. It was made by Stag Arms. If I do my part it will shoot MOA. I think I've had it about ten years now.

    If I were to do it again, I'd go with a heavy barrel and a mid length gas system. Make sure it has an M-4 barrel extension. Maybe 18 inches. I don't think those specs existed when I built it.

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