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Thread: 12.5 Midlength gasport

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  1. #1
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    Quote Originally Posted by lysander View Post
    The only part of the barrel profile that makes a difference is the diameter of the journal.

    A 0.625" journal will require a reduction in port size compared to the same barrel with a 0.750" journal.
    Thank god someone with a grasp of physics finally posted this.
    RLTW

    “What’s New” button, but without GD: https://www.m4carbine.net/search.php...new&exclude=60 , courtesy of ST911.

    Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.

  2. #2
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    I am bumping this thread because I have had it come up on searches a couple times.

    The IWI Zion 12.5” midlength has a .085” gas port after about 3-500 rounds of use.


  3. #3
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    My homemade 12.5" mid length, 14.5 BCM cut down, has a .055 vented setscrew in the front sight base and runs 100% suppressed with a YHM turbo3. I use a standard spring and H buffer. Very smooth with very little gas to face.
    Last edited by joedirt199; 12-31-23 at 20:43.

  4. #4
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    Geissele's new 12.5" CHF barrel has a gas port of .070

    https://geissele.com/geissele-chf-ch...5-56-12-5.html

    edited to reveal that I didn't read the title of the thread as this is a carbine length gas system barrel. :/
    Last edited by ErnieB; 03-04-24 at 16:39.

  5. #5
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    Quote Originally Posted by ErnieB View Post
    Geissele's new 12.5" CHF barrel has a gas port of .070

    https://geissele.com/geissele-chf-ch...5-56-12-5.html

    edited to reveal that I didn't read the title of the thread as this is a carbine length gas system barrel. :/
    Alex, I’ll take “Whale Airway Anatomy” for $500 please. Its sad when attempts are this lazy.
    RLTW

    “What’s New” button, but without GD: https://www.m4carbine.net/search.php...new&exclude=60 , courtesy of ST911.

    Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.

  6. #6
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    Considering my 13” will function with Wolf Gold and a .0625 gas port…yeah.

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