What is this rust looking substance on my chrome-lined barrels?

Discussion in 'General Gun Discussions' started by Cowboybebop, Sep 12, 2016.

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  1. Cowboybebop

    Cowboybebop Member

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    Several of my rifles / shotguns have this look to the chambers - all of the ones with this look are chrome-lined.


    What is this? Is it rust?

    It looks like something that could have been used to thread the barrel into the receiver, like a brazing or some kind of heat mark. It will not come off scratching with a dental pick. The posted pic is of a Winchester SXP Shotgun (with chromed bore). Also noticed it recently on a brand new SCAR at Cabela's.


    What's the deal?
     

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  2. morcey2

    morcey2 Member

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    Odds are it's a preservative coating of some sort.* It should come off with solvent. I can't speak exactly for the SPX, but I own several of its precursor, the venerable 1300, and the barrel extension (with the locking lugs) isn't chrome plated, just the chamber and bore. That might be rust in the pics, but it doesn't look like it to me.

    Matt

    *If you've ever dealt with milsurps, think cosmoline.
     
  3. Horsemany

    Horsemany Member

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    Looks like old gummed oil to me. Remove barrel and hit that with some solvent and a toothbrush.
     
  4. MAKster

    MAKster Member

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    That is oil.
     
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