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Need some AR15 barrel measurements

Discussion in 'Rifle Country' started by nvshooter, Mar 14, 2006.

  1. nvshooter

    nvshooter member

    I want to have a premium barrelmaker spin up a custom AR barrel for me, in the mid-length configuration. Does anybody know or can anyone point me to where I can find exact measurements for where the gas port is in relation to the forward face of the receiver extension? Thanks.
  2. pcf

    pcf Well-Known Member

    Not to be a smart alec, but if whoever is working on your barrel doesn't know this, they shouldn't be working on your barrel.
  3. Quick Karl

    Quick Karl member

    So, if you don't a'ready know the requested info, you should never ask or attempt to learn it?....
  4. Conqueror

    Conqueror Well-Known Member

  5. ants

    ants Well-Known Member

    nvshooter, I bought my Wilson barrel undrilled. Then I assembled it on the receiver with hand guards and gas block so I could mark the exact location. Perhaps you can discuss that option with your barrel maker.

    By the way, it's not only the gas port, it's also the location of the step in barrel diameter that the gas block butts up against. There is more to it than just the hole. That's why it may be useful to offer the whole upper ass'y to the barrel maker to establish the exact location for turning the step and drilling the hole.

    See? This is why it is valuable to ask questions. So you can learn something from a guy who BTDT.
  6. AR15barrels

    AR15barrels Well-Known Member

    The shoulder at the rear of the gas block seat is 8.75" from the front face of the barrel extension.
    9.045" to the center of the gas port.

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