Sig P239 .40 S&W to 9MM Conversion

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    1. #1
      Junior Member
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      Sig P239 .40 S&W to 9MM Conversion

      I know someone who wants to convert a .40 P239 to 9MM. I would think the barrel, magazines and slide or at least the extractor would have to be replaced. Has anyone ever done this?

    2. #2
      Junior Member utahusker's Avatar
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      Oct 2010
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      I'm new here and found this old post.

      To change to 9mm, all you need is a Barsto 9mm conversion barrel and 9mm magazines.

    3. #3
      Junior Member
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      Oct 2011
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      On a 239/40 You can use a Sig Factory 9mm barrel no need to change recoils spring or mags, the 40 mags work fine.

    4. #4
      Senior Member chessail77's Avatar
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      CDNN has 9mm P239 factory Sig barrels for under a 100. but I would restrict the use to practice and range only.

    5. #5
      Junior Member
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      Quote Originally Posted by chessail77 View Post
      CDNN has 9mm P239 factory Sig barrels for under a 100. but I would restrict the use to practice and range only.
      Is it not reliable to do so?

      I recently purchased a .40 P239 but would really like a 9mm instead.

    6. #6
      Senior Member chessail77's Avatar
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      If you purchase a barrel designed for the .40/9mm conversion (Barstow etc.) and use 9mm mags with it, reliability should not be an issue.

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