Sig Sauer Conversion Barrel Sig Sauer P229 357 Sig to 40 S&W 1 in 15 Twist 3.9 Steel Blue

With these Sigarms factory barrels, you can convert your 357 SIG to 40 S&W. 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.