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The Sig .40 S&W to 9mm conversion takes more than just a barrel (unlike the .40 S&W to .357 Sig conversion). The kits that Sig sells (slide, barrel, and magazine) work quite well but since they are Sigs they are pricey.
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This is true for factory 9mm barrels. However, I think what the OP is talking about is a 9mm
conversion barrel like ones offered by Bar-Sto and EFK Firedragon. These 9mm conversion barrels are designed with a larger outside diameter so that they will fit into a .40/.357 frame. They are either semi-drop-in (Bar-Sto's words - 70% will drop in and fit) or match grade (have to be fitted by a gunsmith).
I have a Bar-Sto 9mm semi-drop-in conversion barrel for my .40 P229 and it has been 100% reliable and accurate using .40 mags and recoil spring. Some users have chosen to replace the recoil spring with a 9mm one and used 9mm mags because there have been reports the .40 mags may not feed reliably when fully loaded.
I use my conversion only for cheap range practice so I have never considered using it for CCW. Logically, I can't see why it couldn't be used for carry, especially if the barrel has been fitted and 9mm mags and recoil springs used. However, mentally, I might feel some doubt about reliability just because the gun didn't come that way from the factory. I guess the one concern would be the extractor.