NineX19 3.9″ Match V2 Threaded Barrel for SIG P320C / X-Carry

The NineX19 3.9-inch Match Threaded Barrel adds suppressor- and compensator-ready 1/2×28 muzzle threads to the SIG P320 Compact and compatible later-production X-Carry slides. It combines the distinctive pentagonal fluting of the original NineX19 Match Barrel with an updated barrel hood and deep-cut target crown.

Each barrel is CNC machined in the USA from stress-relieved and heat-treated 416R stainless steel. Broach-cut rifling with a 1:10 twist supports commonly used 9mm ammunition weights ranging from 115-grain range ammunition through 147-grain defensive and competition loads.

SIG P320 Compact Threaded Barrel Features

• Designed for slides using the SIG P320 Compact 3.9-inch barrel configuration
• Compatible with certain later-production SIG P320 X-Carry slides
• Standard 1/2×28 muzzle thread pattern
• CNC machined from stress-relieved and heat-treated 416R stainless steel
• Broach-cut rifling with a 1:10 twist
• Pentagonal flat-fluted exterior
• Updated barrel-hood geometry
• Deep-cut target crown
• Matching thread protector included
• Extra thread-protector O-rings included
• Machined in the USA

Does This Threaded Barrel Fit the SIG P320 Compact?

Yes. This barrel is designed for the original SIG P320 Compact slide using the 3.9-inch barrel configuration.

The P320 fire-control unit can be installed in several grip-module sizes, but the grip module does not determine barrel compatibility. Match the barrel to the slide length and barrel geometry used by your upper assembly.

Does This Barrel Fit the SIG P320 X-Carry?

This barrel fits certain later-production X-Carry slides, but it does not fit every X-Carry slide produced.

Remove the slide and inspect its underside immediately behind the chamber opening. An earlier-production slide marked “1756” is not compatible with this barrel. Later-production X-Carry slides without the “1756” marking use the compatible barrel configuration.

NineX19 guarantees fitment for the original P320 Compact configuration. X-Carry and aftermarket-slide compatibility must be confirmed before the barrel is installed.

Loaded Chamber Indicator Compatibility

Some SIG P320 slides use a mechanical loaded chamber indicator that requires a corresponding relief in the barrel hood. Confirm whether your slide has this component and whether the selected barrel provides the required clearance before installation.

Do not modify the barrel, slide, or loaded chamber indicator solely to force compatibility. Any required inspection or alteration should be completed by a qualified gunsmith.

Is This Barrel Threaded for a Suppressor?

Yes. The muzzle uses the standard 1/2×28 thread pattern found on many 9mm suppressors. A matching thread protector and replacement O-rings are included.

Before firing, verify that the suppressor and mounting system are compatible with the barrel’s 1/2×28 threads. Confirm proper bore alignment and follow the suppressor manufacturer’s installation instructions.

Can I Install a Compensator?

Yes. A compatible 1/2×28 thread-on compensator can be installed. A compensator changes the weight and gas pressure acting on the slide, so the completed pistol should be function-tested with the ammunition and recoil system you intend to use.

Does It Fit Wilson Combat, Polymer80, or Icarus Precision Grip Modules?

Barrel compatibility is determined primarily by the slide and upper assembly, not the grip module surrounding the P320 fire-control unit. A compatible P320 Compact upper can generally be used with an appropriate grip module from Wilson Combat, Polymer80, Icarus Precision, or another manufacturer.

Grip-module compatibility does not guarantee that an unsupported slide or barrel configuration will fit. Confirm the slide model and barrel length independently.

Available Finishes

• Black Nitride
• Gunmetal
• Gold Nitride

Finish availability may vary. Select the currently available finish from the product options above.

What Is Included?

• One NineX19 Match Threaded Barrel for the SIG P320 Compact
• One matching 1/2×28 thread protector
• Replacement thread-protector O-rings

Installation and Function Testing

Individual firearm and aftermarket-slide tolerances can vary. Before live-fire use, inspect the installed barrel for proper lockup, chambering, slide movement, muzzle-device alignment, and unrestricted operation.

Safely function-test the completed pistol with the ammunition, magazines, recoil system, and muzzle device you intend to use. Installation and inspection by a qualified individual are recommended whenever replacing firearm components.

Important Safety and Legal Notice

Always verify that the firearm is unloaded before installation. Do not fire the pistol until barrel fit, slide operation, muzzle-device alignment, and safe function have been confirmed.

Threaded barrels may be restricted in certain jurisdictions. The purchaser is responsible for understanding and complying with all applicable federal, state, and local laws before ordering or installing this product.

Trademark disclaimer: NineX19 products are not manufactured, authorized, endorsed, or warranted by SIG SAUER. SIG SAUER and P320 are trademarks of their respective owners and are used only to identify product compatibility.