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the guns Buds has are all of recent Manufacture so the odds (99.9%) are very high that they have the upgraded trigger that being said the only way to know with 100% certainty is the check the S/N. Buds will not give out the S/N but be confident that if you do get one that needs the upgrade Sig will take care of you

The absolute odds are that Buds has cycled through all the older P320 Stock and your purchase will be fine Michael. Since "Murphy's Law" is still well and good, Sig will take care of this for free and with no hassle if "Murphy" touches you at : https://www.sigsauer.com/support/p320-voluntary-upgrade/