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Yes, the Sig Sauer P320 Compact 9mm pistol is designed and rated to handle +P ammunition. That being said, using +P ammo may cause premature wear on the internals so you'll want to perform inspections more often if feeding a steady diet of +P.

Hi Louis and welcome. Yes, +P ammunition is no issue. Just increase inspection and maintenance frequency and it will be fine. Please pay particular attention to the expended case head and mouth for any signs of overpressure such as bulges or abnormal expansion. Cheers, stay safe and enjoy!

Hi Louis, If you look at the owner manual for the P320, it clearly states the firearm is rated for SAAMI spec ammunition. Since 9mm +P is a SAAMI specification, yes it will handle +P ammo. Stay safe & have a great day!