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Threading a 18.5 Barrel for Choke Tubes

Discussion in 'Shotguns' started by Zeke Menuar, Oct 10, 2003.

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  1. Zeke Menuar

    Zeke Menuar Member

    Jun 24, 2003
    Oregon Monsoon Central
    What is the minimum wall thickness required to thread a barrel for choke tubes? I am thinking of a Mossberg 500 18.5" barrel. Would like to use the win-choke tubes I already have, but that isn't written in stone.

  2. Rat-30

    Rat-30 Member

    Jun 21, 2003
    DFW Texas
    From one of my earlier posts:


    Using Dial Calipers, measure the outside diameter (od) of your barrel:

    Minimum od measurements for:
    0.830 od = Tru Choke
    0.845 od = Win Choke
    0.860+od = Rem Choke
    Helps if bore is concentric to OD, as if not, may neccesitate the use of 'thinner' choke tubes.

    This is a guideline... YMMV


    Hope this helps.

    All the best,
  3. Coltdriver

    Coltdriver Member

    Dec 26, 2002
    I am sure that, regardless of your actual OD, you should take wall thickness measurements at the 12, 3, 6 and 9 o clock positions around the barrel opening.

    You can see such a variance in wall thickness that you may be limited to an extra thin wall choke regardless of your OD.

    I went through this exercise with a gun smith and my police open cylinder barrel in stock form would only support thin wall chokes.

    I spoke to a fellow last week who had 10 Remington 870 barrels in 18 to 20 inch lengths available and based on od and wall thickness only three of them would support rem chokes, the rest would only take a win choke or a tru choke.
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