NineX19 4.7″ Match Threaded Barrel for SIG P320

The NineX19 4.7-inch Match Threaded Barrel adds suppressor- and compensator-ready 1/2×28 muzzle threads to the SIG P320 Full Size platform. 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 Full Size Threaded Barrel Features

• Designed for SIG P320 Full Size slides using the 4.7-inch barrel configuration
• 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

Which SIG P320 Models Use This Barrel?

This barrel is designed for SIG P320 Full Size slides that normally use the standard 4.7-inch barrel configuration.

It is not designed for P320 Compact or X-Carry slides using a 3.9-inch barrel. It is also not a replacement for P320 XFive and other slides requiring a 5-inch barrel.

The P320 fire-control unit can be moved between different grip modules, but the grip module does not determine barrel compatibility. Match the barrel to the slide length and barrel geometry used by the upper assembly.

Does This Barrel Fit the SIG M17?

The SIG M17 uses a full-size 4.7-inch barrel configuration, but M17 slides may incorporate a loaded chamber indicator that requires corresponding clearance in the barrel hood. Confirm the geometry of your slide and the barrel before ordering or installation.

Do not assume compatibility based only on barrel length. Any required inspection or alteration should be completed by a qualified gunsmith.

Loaded Chamber Indicator Compatibility

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

Do not modify the barrel, slide, or loaded chamber indicator solely to force compatibility.

Is This P320 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 thread pattern. 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 on this barrel. Adding 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 Full Size 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 barrel compatibility. Confirm that your slide uses the standard P320 Full Size 4.7-inch barrel configuration.

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 4.7-inch Match Threaded Barrel for SIG P320 Full Size
• 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.