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Thread: MM 2k9 and barrels

  1. #1

    MM 2k9 and barrels

    Ok, the MM 2k9 is cocker threaded right?

    Cause I'm confused now. I can thread in my deadly winds CF barrel into my MM 2k9 body with no trouble. But the freak back and spyder to cocker adaptor I have lock up almost as soon as the threads make. And all three barrels make up fine in my other cocker threaded markers. I'm just confused about what would cause one barrel to work and the others not, are the tolerances really that close? I know to not force them together but am now worried about being able to use a freak back with it, I'd like to have the body/barrel all annoed with the same color theme.

  2. #2
    Join Date
    Jul 2008
    Location
    Massachusetts
    Posts
    551
    They are cocker threaded. Do you have a raw body?

  3. #3
    Join Date
    Aug 2008
    Location
    Chicago, IL
    Posts
    315
    I actually came across the same issue with my 2k9, I have a SS boomstick back that will not thread into the body, but all my aluminum barrels thread in just fine. My guess is that the threads on the body are the very small side of the spectrum and the barrel back is on the very large side. Getting it anno'd may take off enough material of both to allow it to fit, although I'm sure if you hit up Luke he can help you out. You probably just need to run a tap down the threads once or twice, but I personally would be more comfortable having Luke do that then myself.

  4. #4
    Join Date
    Dec 2006
    Posts
    1,620
    I wonder if the threads need to be chased...

    I have this issue with mine, except for some barrels they will thread part of the way before I would need a strap wrench to got the rest of the way.

  5. #5
    what size threading is cocker threading?

  6. #6
    Join Date
    Aug 2008
    Location
    Chicago, IL
    Posts
    315
    Quote Originally Posted by RehKal View Post
    what size threading is cocker threading?
    According to this thread the tap size is: 15/16" minus 46-50 thousandths

    http://customcockers.com/forum/showt...-amp-Die-Sizes

  7. #7
    Join Date
    Jan 2001
    Location
    Cottonwood, Az.
    Posts
    5,742
    If I recall correctly cocker threads were never standardized so on occasion some come up too tight.

  8. #8
    Join Date
    Jan 2002
    Location
    Halifax, N.S., Canada
    Posts
    7,371
    Take one of the tight barrels, apply some grease on the threads, and then screw it into the body. The grease will prevent the metals from heating and sticking together and will prevent the barrel sticking in the body. Quite often, it will remove any rough edges and compress the metal in the threads a bit making them fit much better.
    Except for the Automag in front, its usually the man behind the equipment that counts.

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