Sig Sauer 40SW 4.4" Blue P226 BBL-226-40
Sig Sauer Conversion Barrel For P226 40 Smith & Wesson
With these Sig Sauer factory barrels, you can convert your 357 Sig to 40
S&W or 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.