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Good evening to you!! The manufacturer (H&K) has not rated this firearm for the pressure found in +P ammunition. So no it's not.

In short, No, it is not +P rated.

Hi Douglas and welcome. The HK USP 45 is not explicitly rated for +P+ ammunition by the manufacturer. While the USP 45 is known for its ruggedness and ability to handle +P ammunition, the official documentation and manufacturer information indicate it's not designed for the higher pressures of +P+ loads. Cheers and stay safe!

Not by HK.