The Sig Sauer .357 SIG Conversion Barrel (brand part number BBL-229-357) is a factory replacement barrel built for the P229, letting owners add or restore .357 SIG capability to their pistol. At 3.9 inches, this barrel matches the standard P229 barrel length and is specially heat-treated for toughness and durability, the same process Sig Sauer uses on its factory pistol barrels. Because .357 SIG and .40 S&W share the same case head dimensions, this barrel also fits a .40 S&W P229 with no additional parts needed, giving owners an easy way to run both calibers from one frame. It is a straightforward, factory-spec upgrade for P229 owners who want to add a second caliber option without buying a second pistol.

Key Specifications

• Chambered in .357 SIG.
• Barrel length is 3.9 inches, matching standard P229 dimensions.
• Rifling twist rate is 1:16 inches.
• Built as a factory replacement barrel for the Sig Sauer P229.
• Specially heat-treated for toughness and durability.
• Also fits a .40 S&W P229 frame with no additional parts needed.

Frequently Asked Questions

What pistol does this barrel fit? The Sig Sauer P229, chambered in .357 SIG.

Will this fit a .40 S&W P229? Yes, it drops into a .40 S&W P229 frame with no additional parts required.

How long is this barrel? 3.9 inches, matching the standard factory P229 barrel length.

Buy the Sig Sauer .357 SIG Conversion Barrel

Order the Sig Sauer .357 SIG conversion barrel for your P229 from our Lubbock, Texas gun shop for fast, insured shipping. Browse more Sig Sauer handgun barrels for your P229.