Current Options for a USP 40S&W to 9mm Conversion
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Thread: Current Options for a USP 40S&W to 9mm Conversion

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    Default Current Options for a USP 40S&W to 9mm Conversion

    Good Evening All,

    An instructor friend has a USP in 40 with UTM setup that he is looking to sell for a reasonable price. I'm interested but would prefer to convert it to live 9mm as I really don't want to have to stock up on another caliber. The only conversion posts I found here were from a number of years ago and not really helpful. Besides a barrel and recoil spring what else is needed to convert a $) S&W USP to 9mm? Who makes the best conversion barrel, preferably threaded?


    Thank you!

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    You need a complete top end slide assembly and 9mm mags. You might as well just buy a 9 if you have no interest in .40.
    PorterM and ca survivor like this.
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    I second finding a 9mm for sale, it will be more reliable and cost less than buying a .40 and converting it.

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    Some people had good results with the Elk Fire conversion barrels and others had issues. They don't sell them any longer I believe.

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    Looks like they still sell them.

    https://www.efkfiredragon.com/heckler-and-koch1.html

    I’m thinking about trying one of the full size 357 sig conversion barrels.

    Doc

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    40 is to 357 is no brainer reliable but not so down to 9.
    PorterM likes this.

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    Quote Originally Posted by Doc44ga View Post
    Looks like they still sell them.

    https://www.efkfiredragon.com/heckler-and-koch1.html

    I’m thinking about trying one of the full size 357 sig conversion barrels.

    Doc
    You're right, I was looking at the USP c. I may try one of their P30 40 to 357 barrels.

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    The issues with just using a conversion barrel and magazine when going from .40 to 9mm (in MOST pistols) are that the breech face and extractor are different as are the recoil springs. This can cause problems that are as minor as erratic ejection of brass to something as major as the weapon not cycling properly and jamming. I believe the extractor is the same for both calibers in the USP line but the slide, breech face, and perhaps some other components will still be different. The best way to convert from .40 to 9mm (and often only way for true 100% reliability in MOST pistols) is to change the entire slide/recoil assembly. If it is just a range toy, a conversion barrel might be fine for you. If you have any ideas about carrying the weapon or potentially using it as a defensive weapon to keep in a vehicle or around the home, I would not recommend it. Some people find them to work just fine and others have issues but the important thing is that you are aware of these things before you decide on your course of action. I should add that I have zero experience with a conversion barrel in any HK pistols so I am speaking in general terms as far as why people may or may not have recommendations and why I would not use a conversion barrel in a defensive firearm to go from .40 to 9mm.

    Hopefully someone with more experience will chime in soon but those are my concerns.
    Last edited by PorterM; 11-06-2019 at 01:03 AM.

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    What do you consider a reasonable price?

    9mm USPs are a great value on the used market.

    40sw USPs (or any other 40) are so cheap its tempting to buy and try to snag the parts low enough to make it rational. Then there is the hoping it will run 100 percent with all ammo, like a factory USP will.

    The owner at a supplier we buy from saw me wearing an HK hat and mentioned he cannot seem to sell his USPc 40. I suggested he hang on to it for a decade or two maybe 40 will come back in vogue.






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    Thanks All going to keep looking for a 9mm.

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