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This is a .357 sig barrel. Drops right in place of the .40 barrel for a quick caliber swap. Hope that helps!

Hi Jerr, This is a .357 barrel.

This barrel is chambered in .357SIG - Converts your P229 from .40S&W to 357SIG or replaces your original 357SIG barrel. These are factory Sig Sauer drop-in barrels.