Barrel thread specs?

Discussion in 'Sako Medium Actions' started by 71Scamp, Jul 29, 2020.

  1. 71Scamp

    71Scamp Active Member

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    L57 =?
    L579 =?
    AII =?

    I have some barrel swap potential, but I want to ensure that the threads will match. I do have and will employ headspace gauges.

     

  2. ricksengines

    ricksengines Sako-addicted

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    Be advised, Sako had a really bad habit of torking barrels so tight that the barrel seat was actually crushed. The result is that when you swapped a barrel it would spin up on the receiver about 1/4 to 1/2 turn past the original alignment point. Peaning the barrel on the seat can result in taking the crush ring out of the barrel so it will seat very close to its original position.

    rick
     
  3. 71Scamp

    71Scamp Active Member

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    As long as the threads match, I can adjust the head space with shims of proper thickness. Peening the shank seems to me a little ham fisted. Sorry
     
  4. ricksengines

    ricksengines Sako-addicted

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    Peening is the standard solution.

    rick
     
    paulsonconstruction likes this.
  5. 71Scamp

    71Scamp Active Member

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    For some maybe.
     
  6. ricksengines

    ricksengines Sako-addicted

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    You asked. My job is to give you the best advice I have in my quiver. Gently peening the barrel seat works and the result is virtually invisible. Spacers are an iffy proposition because of how thin they would have to be and what happens to them when you torque the barrel into place.

    rick
     
  7. 71Scamp

    71Scamp Active Member

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    I do appreciate it.
     

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