Discussion in 'Technical Questions & Information' started by privateer 1939, Jul 18, 2012.

  1. privateer 1939

    privateer 1939 New Member

    Jul 17, 2012

    i am dropping in a 357 sig barrel into my sig p229 40 cal it necessary to change the original factory recoil spring to prevent amy harm which may result from higher chamber pressures?

  2. Hammerslagger

    Hammerslagger New Member

    Jul 30, 2009
    I cannot speak to the SIG P229.

    The Glock 27, 33 (.40, .357) use the same recoil spring assembly. The same is true of the G 23 and G 32.

    One word of caution. Get a .357 SIG magazine or put a .357 SIG follower in your .40 S&W mag to shoot the SIG cartridge; or do not fire the last round out of the magazine.

    It has been my experience with Glocks (using a .40 S&W mag) that the last .357 SIG round off of the .40 follower can "stump its toe" an be driven much deeper into the cartridge case on the loading stroke. If this happens, and the round is fired, you can experience significant over-pressure problems!

  3. Helix_FR

    Helix_FR Active Member

    Apr 14, 2009
    Imperial, MO
    The original recoil spring for the 40 also works with the 357 sig on the 229. Also though I don't know if Hammerslagger is talking about the glock mags or the sig mags but the sig .40sw mags are the same ones used for the 357 sig.
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