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Thread: Gas system explanation

  1. #11
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    So as long as the port is properly sized there shouldn't be a difference in pressure or wear and tear?

    I have a DD M4A1 and a DDM4V5. Should they be equivalent as far as pressure?

  2. #12
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    I have another question.

    What is considered the optimum gas system for barrel lengths 14.5, 16, and 10.3?

    What is considered overgassed and what would produce the least wear and tear?

    Thanks so much.

  3. #13
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    Quote Originally Posted by odugrad View Post
    I have another question.

    What is considered the optimum gas system for barrel lengths 14.5, 16, and 10.3?

    What is considered overgassed and what would produce the least wear and tear?

    Thanks so much.
    16" = .60" I believe
    14.5" = .062"
    10.3" = .071".

    If we are talking carbine length gas systems.
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  4. #14
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    16" and 14.5" barrels from most companies (Colt as an example) use the same .063 gas port.

    Quote Originally Posted by sinlessorrow View Post
    16" = .60" I believe
    14.5" = .062"
    10.3" = .071".

    If we are talking carbine length gas systems.



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  5. #15
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    And why is a 14.5 carbine better than a 16"?

    Does the longer dwell time on the 16" reduce the pressure? Wouldn't that be less harsh on the rifle?

  6. #16
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    Quote Originally Posted by Clint View Post
    If the gas ports are properly sized for each barrel, they will have nearly identical gas drive.
    This sentence made it click for me......Finally.

    Shorter barrels need larger ports to move more gas because there is less time (barrel length) before bullet leaves the barrel venting all gas. And vice-versa. Right?

    And buffer/spring weights are used to compensate back to good operation with improper ports? Finally may be getting it.

    Now I possibly know why my first used AR a decade ago was a jamomatic, but my current high quality choice functions flawlessly out of the box.

    If I add a suppressor and not a switch block increaseing length, gas would increase, so would I just change buffer/spring to bring back normal operation? Is there a formula or just trial and error?

    Noah

  7. #17
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    Quote Originally Posted by ndmiller View Post
    This sentence made it click for me......Finally.

    Shorter barrels need larger ports to move more gas because there is less time (barrel length) before bullet leaves the barrel venting all gas. And vice-versa. Right?
    Assuming the gas lengths are the same, yes.
    And buffer/spring weights are used to compensate back to good operation with improper ports? Finally may be getting it.
    Yup, your ammo choice plays a role in this too.

    If I add a suppressor and not a switch block increaseing length, gas would increase, so would I just change buffer/spring to bring back normal operation? Is there a formula or just trial and error?
    If you're not added an adjustable gas block, yes. There has been a lot of trial and error done by some very knowledgeable people. You can find most of that info on this site. You should be able to find the correct buffer/spring combo for just about any setup on this site
    Noah
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