Results 1 to 4 of 4
  1. #1
    Junior Member
    Join Date
    Mar 2009

    USPc 40S&W to 9mm conversion

    I have had my USPc 40 S&W for a while now and absolutely love it, but i would like to know if i can get a 9mm drop in barrel for it.

    I have found a few barrels on Midway USA and EFK Fire Dragon but i want to be sure they will work before i buy them.

    Has anyone done this or know that it can be done?

  2. #2
    Senior Member HGF Gold Member unpecador's Avatar
    Join Date
    May 2008
    Found this on Wikipedia...

    Heckler & Koch does not authorize caliber conversions, but a separate barrel for a .357 Sig or .40 S&W can be purchased from HK, or from companies like Midway USA or Jarvis, Inc. EFK Fire Dragon, an Arizona based pistol accessories company produces conversion barrels for both Full Size and Compact USP models. These conversion barrels can convert a .40 S&W to .357 Sig, and vice versa. They also manufacture 9mm conversion barrels. These 9mm conversion barrels can convert a 40/357Sig to a 9mm, but not a 9mm to a .40/.357 Sig. Also, a more powerful recoil spring may be need for a .357 Sig conversion as the .357 Sig operates at a higher PSI. Heckler & Koch currently does not make the Full Size USP in .357 Sig, making the .357 Sig conversion for the Full Size .40 S&W a highly desirable addition.

  3. #3
    Member Spartan's Avatar
    Join Date
    Dec 2006

  4. #4
    TOF is offline
    Senior Member TOF's Avatar
    Join Date
    Sep 2006
    Northern Arizona
    I can't speak for H&K equipment but do have a 40 to 9 conversion by Storm Lake for my M&P40.

    So far I have experienced one FTE per hundred rounds fired. The first two were light loads.

    I have only fired 300 to date. All FTE's were with Winchester brass. I have fired around 150 in Remington brass without failure. Brass may be critical as the extractor has no backup on the far side of the case to hold the case in the claw. The slot in the breech face normaly provides a surface opposite to the extractor which prevents the case from shifting left and falling free of the extractor. Given that .40 Cal is .045" larger than 9MM it is impossible to grip the 9MM case in the normal manner with a .40 cal slide.

    If you expect 100% reliability don't buy a conversion unless it includes a new slide and barrel.

    If as with myself you want a little lower cost practice and don't mind an occasional trouble drill thrown in get a barrel.

    Just remember the extracter design will impact how frequently it fails. Not all are created equal.

    Good luck and enjoy.

Remove Ads

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Search tags for this page

h&k .357 conversion kit to.40
h&k usp .357 sig barrel
h&k usp 357 sig 9mm conversion
hk usp 40 conversion
hk usp 40 conversion barrel
hk usp 40 to 9mm conversion

hk usp 9mm conversion barrel


hk usp compact .40 to 9mm conversion


hk usp compact conversion barrel

usp 40 to 9mm

usp compact 40 to 9mm conversion


usp compact 9mm conversion barrel

Click on a term to search for related topics.