With sig sauer factory barrels, you can convert your p229.357 sig to.40 s&w or your p229.40 s&w to.357 sig.The barrel is specially heat-treated for toughness and durability.
Caliber Or Gauge: 357 Sig Length: 3.90" Model: P229 Twist: 1:16" Sights: None Bore Type: Rifled Finish: Nitride