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Factory Blue

Discussion in 'Gunsmithing' started by bisley, Jan 5, 2017.

  1. bisley

    bisley Member

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    How does the factory blue break down guns with the inside of the receiver and sides of the monoblock left unblued?
     
  2. ramorton

    ramorton TS Supporters TS Supporters

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    Never have seen one like that.

    What brand
     
  3. bisley

    bisley Member

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    perazzi, ljutic, browning, most all break down shotguns.
     
  4. JACK

    JACK Well-Known Member Supporting Vendor

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    Bisley. I understand adn wonder that too...

    It seems they do it to avoid th scrape marks that would be common and ugly.
     
  5. h-n-d

    h-n-d Member

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    I would say they blue the entire gun then remove the blue from areas you mentioned
     
  6. Rebel Sympathy

    Rebel Sympathy Well-Known Member

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    From what I have seen that is correct.
     
  7. David McMillen

    David McMillen Well-Known Member

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    I believe the barrels are plugged before dipping them in a hot blue tank.
     
  8. Stl Flyn

    Stl Flyn Banned User Banned

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    They do final machining after the bluing. If you plug a barrel before you put it in the hot salts, you better be in full protection garb, and a diaper.

    Think about how air expands when heated. Then think about blowing a cork in 300+ degree caustic liquid. Just a single drop of room temperature water causes a pretty good reaction. A slight small leak of water through the cork from the water bath prior to bluing could be a real show.
     
    Last edited: Jan 14, 2017
  9. bsd

    bsd Active Member

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    The inside of the barrel is blued, then it is polished.
    Barrel reblueing isn't cheap, and that's mostly because the dip itself costs little, but then polishing and preparing is hourly labor
     
  10. Deadedd

    Deadedd Active Member

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    Blueing is actually is rust. Somewhere on TS, I just watched, showed a video showing the blueing process.
     
  11. shotgun52

    shotgun52 Active Member

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    How did beretta do it on the 682x traps with the black receivers. Mine still has the black on the face of the receiver where it was never removed.
     
  12. Big Az Al

    Big Az Al Well-Known Member

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    To answer the second part of this first. When a barrels plugged for bluing, a threaded rod is used to hold caps on the barrel. Otherwise a plug or cork will blow out.

    Because any chemical can bleed over and leave white where you want black.

    First you take a piece of fine wet or dry sand paper backed by something like a file and take all the black you can reach this way. Then if there are areas that you can not reach this way then you can carefully use a little mild acid to remove the bluing. Oiled at that point you have the white metal inside the action.
     
  13. Big Az Al

    Big Az Al Well-Known Member

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    Some manufacturers will use stop off paint and then with a cathode shaped so the chrome flow right hard chrome the inside of the action so it is white that way.

    The Winchester 101 is one that uses hard chrome to keep the inside of the action and mono-block white.
     
    bisley thanked this.