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Colt gas tube diameter?

Discussion in 'Black Rifle Forum' started by cliffsta, Mar 4, 2013.

  1. cliffsta

    cliffsta Who, me?

    Dec 3, 2009
    Done a LOT of searching on the web and can't find an answer.

    I wanna buy a YHM gas block with flip-up sight since I"ll be springing for an optic soon. The YHM gas block has a .750 bore diameter for the gas tube. Is this the standard size gas tube for all carbine-length ARs? Specifically my 6920.

    I just don't wanna go through the hassle of ordering an expensive part to get it home and find out its the wrong size.

    Thanks in advance.
  2. Atomic Punk

    Atomic Punk

    Mar 11, 2008
    i think the .750 bore diameter is referring to the outside diameter of your barrel, not anything to do with the hole for the gas tube.

  3. The .750 is the size of the barrel it will fit. I believe there are two other sizes, one a .625 and the bull barrel at .936.
  4. mvician

    mvician Lifetime Member

    Jun 8, 2007
    NW Indiana
    The .750" YHM flip/gasblock will fit your 6920 barrel.
    Last edited: Mar 5, 2013
  5. faawrenchbndr

    faawrenchbndr DirtyThirty fan CLM

    Nov 24, 2005
    Gas tube diameters are standardized. Barrel diameter is the concern as others stated above.
  6. cliffsta

    cliffsta Who, me?

    Dec 3, 2009
    Oh okay. I was clearly confusedx10

    Thanks for answering this question guys.
  7. CigarandScotch

    CigarandScotch Fartacus

    Sep 22, 2011
    Naw Cackalacky
    You'll like it. I just put one on mine and it works and looks great.