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Firing pin protrusion

Discussion in 'Gunsmithing and Repairs' started by jacobhh, Nov 19, 2007.

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  1. jacobhh

    jacobhh Member

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    I have a new firing pin I wish to install.

    It needs to be shortened about .060 to meet
    protrusion spec. Not having a lathe, I was thinking
    of stoning it down. Would that work OK if I went
    slow with it? Any advice etc.?
     
  2. rcmodel

    rcmodel Member in memoriam

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    Firing pin for what?

    Seems kind of unusual that a new firing pin would be .060" too long.

    1224.jpg
    rcmodel
     
  3. gunsmithgirl

    gunsmithgirl Member

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    I agree with RC. Double check your specs.
     
  4. jacobhh

    jacobhh Member

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    RC:

    I was surprised also so I called Tubb in Texas. It's a Tubb Speedlock.
    They ship it long expecting it to be turned down for a custom
    fit to your bolt. That, IMHO, is unwise. Except for pin length
    it's a drop-in. They tell you in the literature: 'must be installed by
    a competent gunsmith' -in parentheses at the bottom of the
    description. Although it's pretty obvious, someone might install
    as is then go to the range and puncture primers.

    The whole thing may be folly, but my follow-through gets shakey
    after a few heavy loads so I thought I'd give it a try.
     
  5. rcmodel

    rcmodel Member in memoriam

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    A Tubb Speed-lock for what?

    If it's a round firing pin, like for a 700 Rem or something, you might be able to chuck it up in a drill press or handheld drill and stone the tip down.

    The rounded contour on the end is VERY IMPORTANT, so try to copy the old firing pin tip as close as you can eyeball it.

    1224.jpg
    rcmodel
     
  6. jacobhh

    jacobhh Member

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    Sorry RC. In my off-topic rant I forgot to answer the question.
    It's an 8mm Mauser98, Changed a bit (bbl cut back behind the
    counter-bore, Timney trigger and handgun scope on an S&K
    mount.) The bolt & receiver are unaltered.
     
  7. Jim K

    Jim K Member

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    Rcmodel is right, that is a good way to do that job. Just keep the firing pin top close to spherical and you will be OK.

    BTW, it is rarely excessive firing pin protrusion that causes pierced (blanked) primers, as the firing pin simply stops in the primer. What causes blanked primers is a too light firing pin and/or a too weak firing pin spring. That means there is not enough firing pin momentum to resist the internal gas pressure, so the firing pin is pushed back into the bolt and a disc out of the primer follows.

    Jim
     
  8. jacobhh

    jacobhh Member

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    Thanks guys. I'm going to do as advised, and I appreciate
    the clarification on the primer issue, Jim.
     
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