Pennsylvania Firearm Owners Association
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  1. #1
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    Default Discoloring inside the slide on my SIG?

    Hoping this is not what I think it is, but perhaps something else.

    The pictures are a bit blurry, but you can see the discoloration on the inside of the slide, right above where the barrel sits.

    Is this rust? Or something else?




  2. #2
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    Default Re: Discoloring inside the slide on my SIG?

    Stainless slide, can't rust. Mine looks like that too... and it has about 2000 rds through it and hasn't broke yet. Maybe its from when they put the nitron coating on.

  3. #3
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    Default Re: Discoloring inside the slide on my SIG?

    Quote Originally Posted by SigSauer226 View Post
    Stainless slide, can't rust. Mine looks like that too... and it has about 2000 rds through it and hasn't broke yet. Maybe its from when they put the nitron coating on.
    Stainless is NOT stain proof. It simply stains LESS. I'm not sure what you've got going on there, as the pics aren't very good.
    There's no such thing as a free lunch.

  4. #4
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    Default Re: Discoloring inside the slide on my SIG?

    Quote Originally Posted by sprrdhawk44 View Post
    Stainless is NOT stain proof. It simply stains LESS. I'm not sure what you've got going on there, as the pics aren't very good.
    This. ^^^^^^^

    Stainless steels can and do rust. Protect your firearms accordingly.


    We don't even know what Sig we're talking about here. Hard to be positive it's stainless.



    The picture sucks. (No offense). Is the gun clean of powder residue?

    Also, how new, (or old is the gun)? Having never bought a new Sig I don't know, but many new pistols come from the factory in a packing grease.
    Last edited by rwb1500; September 29th, 2011 at 11:30 PM.
    Selling off a a sizeable Spyderco collection here

  5. #5
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    Default Re: Discoloring inside the slide on my SIG?

    That almost looks like heat caused discoloration. Sorta like case-coloring.
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  6. #6
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    Default Re: Discoloring inside the slide on my SIG?

    Stainless steel must contain at least 10.5 % chromium. It is this element that reacts with the oxygen in the air to form a complex chrome-oxide surface layer that is invisible but strong enough to prevent further oxygen from "staining" (rusting) the surface. Higher levels of chromium and the addition of other alloying elements such as nickel and molybdenum enhance this surface layer and improve the corrosion resistance of the stainless material.

    Stainless does not "rust" as you think of regular steel rusting with a red oxide on the surface that flakes off. If you see red rust it is probably due to some iron particles that have contaminated the surface of the stainless steel and it is these iron particles that are rusting. Look at the source of the rusting and see if you can remove it from the surface. If the iron is embedded in the surface, you can try a solution of 10% nitric and 2% hydrofluoric acid at room temperature or slightly heated. Wash area well with lots and lots of water after use. Commercially available "pickling paste" can also be used.


    I hope this helps.
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  7. #7
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    Default Re: Discoloring inside the slide on my SIG?

    OP: is this the discoloration you're talking about?


  8. #8
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    Default Re: Discoloring inside the slide on my SIG?

    Quote Originally Posted by knight0334 View Post
    That almost looks like heat caused discoloration. Sorta like case-coloring.
    It does actually.

    If anything it appears to be from some kind of heat.

  9. #9
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    Default Re: Discoloring inside the slide on my SIG?

    Quote Originally Posted by SigSauer226 View Post
    OP: is this the discoloration you're talking about?

    Exactly.

    That's exactly what mine looks like. Only it's a bit more.

  10. #10
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    Default Re: Discoloring inside the slide on my SIG?

    It looks like the "bluing" you get on exhaust pipes on motorcycles near the heads and on the heat shields, caused by the heat of the pipes. They have cleaners for the pipes on bikes, see if it's safe to use on guns. Just trying to help, those who know don't flame me, I told him to ask if it's safe cause I don't know.
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