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Thread: +2 gas system?

  1. #1
    Grandmaster Rookie's Avatar

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    +2 gas system?

    What are the advantages/disadvantages of running a rifle +2 gas tube?

  2. #2
    Master Hohn's Avatar

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    Lower bolt carrier velocity and acceleration, less recoil and wear.

  3. #3
    Expert

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    Hohn is right. It tears up your stuff less when you are running heavy bullet loads with slow powders.

    The gas port pressure was never intended to be as high as it is with your Vargets and RE-15s, much less something like MR2000.

    Some argue that reducing port size solves it, but thing is, the Venturi Principal isn’t a theory. Reducing the port size might relatively decrease the VOLUME of gas that gets into the tube before the bullet unseals the muzzle, but it will at the same time relatively increase the SPEED of that gas jet. No free lunch.

    It was only intended for fast powders and light 55-60 grain bullets.

    We have changed the barrel configurations significantly to enable stabilization of steel core ammunition, invented longer bullets to shoot well in those tight twist barrels, and then adapted our powder charges and formulations to perform better with the bigger bullets...

    ...but the port location didn’t change, did it?
    Last edited by natdscott; 1 Week Ago at 19:55.
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  4. #4
    Grandmaster Rookie's Avatar

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    I'm looking to run lighter bullets at screaming hot speeds...

  5. #5
    Expert

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    But don’t be doin a +2 on a 20” tube. Same deal as an 18” with rifle gas, only worse: dwell time isn’t always long enough, and you short stroke.

    I would only consider a +2 in a 24” or 26” tube that I intended to run heavy loads in...like Mk 262 or hotter.

    Light loads like NATO 55 ball are asking for trouble.
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  6. #6
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    Yeah.

    Light bullets = fast powders. Fast powders have a lower gas port pressure. So no need for extended gas.
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  7. #7
    Grandmaster Rookie's Avatar

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    Dtech suggested a +2 on my 6mm creedmoor with 22 inch barrel.

  8. #8
    Turbo Areoflyer09's Avatar

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    Quote Originally Posted by Rookie View Post
    Dtech suggested a +2 on my 6mm creedmoor with 22 inch barrel.
    My factory built Savage (6mm Creedmoor) is running a 22” barrel with a +2 gas tube. It’s a very soft shooter.
    “...I blame Turbo” -Everyone

  9. #9
    Grandmaster Rookie's Avatar

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    What weights are you shooting? What's the twist rate?

  10. #10
    Master bcannon's Avatar

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    Im running a 22" on my 6.5creedmoor with +2 gas and its a soft shooter too. Its a 1:8 and I use 143gr.


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