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Will .40 mags work in a Glock 9mm?

Discussion in 'General Glocking' started by mr00jimbo, Nov 2, 2012.

  1. Would a Glock 22 mag reliably hold 9mm rounds, and feed through a model 17?
    Same with the 23 mag feeding 9mm through a 19?
  2. 1-2man

    1-2man Part Time

    Sep 28, 2006
    Yes. Reliably, maybe. I've had no problems with limited use at the range.

  3. SJ 40

    SJ 40

    Jan 17, 2011
    Their are some differences between Glock 9 mm and 40 S&W magazines.
    The spacing between the feed lips being one of them.

    9mm [.325-.335
    357 Sig[.360-.370
    40 S&W[.360-.370
    10 mm[.360-.370
    45 [.425-.435

    While it may work it may be less then ideal. SJ 40
  4. SCmasterblaster

    SCmasterblaster Millennium Member

    Sep 24, 1999
    Hartford, Vermont
    a millimeter difference in cartridge diameter doesn't cause problems. :cool::shocked:
  5. Nestor

    Nestor Lean & Mean

    Jul 13, 2003
    The only real use of such invention would be for the risking reliability to gain 4 more rounds (for any other application) is just plain stupid.
  6. Gallium

    Gallium CLM

    Mar 26, 2003
    Yes, it will work. No, it will not work reliably. Loading up the mag close to its max capacity (which will mean more rounds because of the smaller diameter of the 9mm round) causes rounds to be pushed out of the mag when they are out of the mag, and potential for feed issues when the mag is in the gun.

    Ask me, "how do you know this?" :)