Sig Sauer P320FS 5.5-inch Threaded 9mm Barrel

This factory replacement barrel is made for the Sig Sauer P320 Full-Size (P320FS) pistol and is chambered in 9mm Luger. The barrel measures 5.5 inches and features a Nitron finish and a loaded chamber indicator (LCI). Threading is 1/2-28 RH to accept compatible muzzle devices. SIG SAUER factory replacement barrels are heat-treated for toughness and durability. This barrel is not compatible with the P320 X-FIVE slide.

Key Specifications

• The barrel measures 5.5 inches for Full-Size handling.
• Chambered in 9mm Luger.
• Designed to fit P320 Full-Size (P320FS) configuration.
• Finished in Nitron for corrosion resistance.
• Features a loaded chamber indicator (LCI) for visual/physical chamber status.
• Thread configuration is 1/2-28 RH to accept compatible muzzle devices.
• Sold as a factory replacement and heat-treated for durability.
• Not compatible with the P320 X-FIVE slide.

Built to SIG SAUER factory tolerances, this 5.5-inch threaded barrel provides a direct-fit option for owners of P320 Full-Size pistols seeking a durable replacement or an upgrade for range and competition setups. Its Nitron finish and threaded muzzle allow straightforward attachment of 1/2-28 compatible devices while the loaded chamber indicator supports safe handling practices. For those who prioritize OEM fitment and dependable construction, this barrel delivers a practical, serviceable solution.