Sig Sauer Conversion Barrel Sig Sauer P229 40 S&W to 357 Sig 1 in 16 Twist 3.9 Steel Blue

With these Sigarms factory barrels, you can convert your 40 S&W to 357 SIG. These barrels are made of blue chrome moly steel. If converting the P239, a new magazine will be required (sold separately). Other models require no magazine change.