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Hi Justin, these are recently manufactured P320's and should have the upgrade already. You just need the serial number to verify this through Sig at 603.610.3000, option 1 - Hours: Monday-Friday: 8:30am – 6pm EST. On the unlikely chance it does not Sig will take care of this at no charge to you at - https://www.sigsauer.com/support/p320-voluntary-upgrade/
James G.
8 years ago