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Hi John, the slide is not stamped 320, it is stamped M18 and it is the M18 Serial Number Series. Stay safe & have a great day!

Hi John and welcome. I would confirm with Sig Customer Service as some are shown with both P320 and M18 on the slide: -- https://www.sigsauer.com/p320-m18.html -------------- 1-603-610-3000, option 1. Business hours are Monday-Friday 8:30am-5pm EST. Or by online inquiry here: https://www.sigsauer.com/customer-service-contact

You can expand the picture and see M18 stamped on the left hand side of the slide