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G23 .40 to 9pm conversion barrels

Discussion in 'General Glocking' started by wppreach, May 27, 2011.

  1. wppreach


    Likes Received:
    May 25, 2011
    Wills Point, TX
    I have been looking at conversion barrels for my G23. I am not really thinking of carrying the 9mm barrel, I just would like to cut some cost on practice ammo. Who makes the best conversion barrel? LWD? Storm Lake? KKN? How reliable is .40 pistol with a 9mm barrel? Would I need to switch out the mainspring?
  2. JR

    JR Moderator Millennium Member

    Likes Received:
    Dec 29, 1998
    Oldtown Idaho USA
    Normally I do not answer these "which is better" questions but will make an exception because of the question "how reliable". BTW: I vote LWD as best!

    The 40-9 conversion barrels perform excellent with this one exception, approximately 1% will fail to eject weak 115 gr ammunition.

    About 1% of our 9mm conversion barrels are affected by the poor performance of low powered 115 grain ammunition causing a Failure To Eject (FTE). A good example of ammunition that is “most likely to fail” is Winchester White Box (WWB). This rare failure is too low a percentage to make an issue, however it is one we are well aware of. The fix to resolve this issue is quite simple:

    1 Clean and lube your slide and barrel.
    2 Shoot 1 mag to 1 box of good quality +P or +P+ ammunition through the barrel.
    3 Try the FTF ammunition again. If it runs... great! If you experience more failures you will have a couple choices to make:
    Fix A Reduce the recoil spring weight to 11 lbs. Cost is about $25 for stainless steel guide rod and reduced power spring.
    Fix B Shoot 124 gr or a better quality 115 gr ammunition exclusively. The FTF 115 gr ammunition you are currently using is no longer a valid option.

    What causes this problem? Several issues come into play.
    1 The 40 slide and (40 conversion) barrel is thicker than any standard 9mm slide and barrel. This extra thickness equates to more weight. The combined extra weight taps the energy of the "weak 115 gr ammunition” to its complete demise. It simply lacks in power and fails to reliably eject the spent round.
    2 Every once in awhile a Failure To Feed/Failure To Eject (FTF/FTE) is caused by a fit issue. We resolve fit issues by pumping +P or +P+ ammunition through the gun. This hot ammunition provides extra pressure and the pressure will positively align any and all components. Once they are all aligned there is no longer a fit issue. The FTF/FTE is usually resolved.

    FYI: Several manufactures are currently producing low powered 115 gr 9mm loads. This ammunition is also known to produce failures in all standard model Glock 9mm pistols.

    If you have a Gen1,2,3 pistol this issue is easily resolved by reducing the recoil spring weight to 11 lbs.
    If you have a Gen4 you will need to pick up the current (as of 5/2011) issue 9mm recoil spring from the factory.