CZ 550 and CZ 550 Magnum

Discussion in 'Gunsmithing' started by Rustystud, Apr 15, 2015.

  1. Rustystud

    Rustystud Well-Known Member

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    Does anybody had a tenon drawing for these actions, and do you have a picture or drawing of your action wrench you use for these actions?
    Nat Lambeth
     
  2. Hired Gun

    Hired Gun Well-Known Member

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    Before I knew better I used to worry about tennon blueprints but not knowing the history of the action plus factory variances I have found it best to treat every rifle as an individual and draw up a print for it from my own measurements. This way you can get the thread fit as tight as possible. It's the mark of a pro to have it fit like a micrometer spindle from the first thread forward. This is one thing we can bring to the table that a CNC machined barrel has a very hard time doing. We can also custom tailor the operating clearances for the intended application.

    For an action wrench I use the bolt as a rough pattern and make a Holland style wrench for it out of tool steel. Here is one I built for the Stiller 1.6" actions we use to build our 338 CT Max and 375 Chey Tacs on next to a real Holland 700 wrench. It's been to 200 foot pounds in a test. No perceptible twist observed.

    [​IMG]
     
  3. Punisher

    Punisher Well-Known Member

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    It is large ring Mauser.

    We just did one of these. The action wrench I made out of a piece of bar stock and a u bolt. I cushioned it with lead tape.

    A standard action wrench won't work since the thing is a cylinder with integral recoil lug.
     
  4. Punisher

    Punisher Well-Known Member

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    The only thing a CZ has going for it is that you don't have to time the barrel to mill an extractor slot.

    I hope you plan on using the factory stock. An aftermarket stock has to be built custom. ($6-900!)
     
  5. Punisher

    Punisher Well-Known Member

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    I don't think this style will work on the action. The ejector will need a special slot cut into this wrench.
     
  6. Hired Gun

    Hired Gun Well-Known Member

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    It was shown as an example of what I might do and did for that big Stiller. A groove for an ejector is an obvious given if needed and an easy addition. I could just as easy build a front ring external clamp style that fit the diameter with reliefs and flats cut to support whatever structures stuck out of it for example like a Ruger, Winchester, Weatherby or Enfield does. The internal ones are simpler to build. The hardest one was for a Browning A Bolt that was heavily engraved and paper thin. They have an odd shape to them.
     
  7. Punisher

    Punisher Well-Known Member

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    It's a good idea, don't get me wrong. :)

    The CZ seems to me like a poorly thought out winchester model 70.

    All of the same drawbacks and then some.