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,[11] 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 needed 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.
What do some of you know about these places that make barrels? Cost? Are they good quality components? And is a different recoil spring necessary to shoot 357? That paragraph kind of eludes to that, but I was left not really knowing for sure.
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