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Sig P320 the guns Buds has are all of recent Manufacture so the odds are very high that the 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

Buds have cycled through to the "New" batches of pistols and there is a 99.9 percent chance the upgrade has already been performed by Sig. On the remote chance it has not, Sig will take care of it no charge. https://www.sigsauer.com/support/p320-voluntary-upgrade/