Sig Sauer P320 Subcompact 9mm Luger 4.3" Threaded Barrel, Steel Black

The Sig Sauer P320 Subcompact 9mm Luger threaded barrel gives you the flexibility to run a suppressor or muzzle device on your compact carry gun. This 4.3-inch steel barrel is a straightforward swap for shooters who want to add a can to their P320 without replacing the entire firearm. Whether you're building a suppressed home-defense rig or exploring the quiet-shooting side of 9mm, a threaded barrel is the foundation—and Sig makes it easy with their modular design.

The beauty of the P320 platform is how simple barrel swaps are. Field-strip your slide from the receiver and grip module, slide out the old barrel, and drop this one in. No gunsmithing required, no special tools. It comes with a thread protector cap to keep your threads clean when you're running it unsuppressed, which beats the alternative of shooting an unprotected barrel.

This barrel is engineered for P320 Compact, Sub-Compact, and Carry models—both X and non-X variants—as long as your gun does not have a loaded chamber indicator. The 1/2 x 28 RH thread pitch is the mil-standard for 9mm suppressors, so you'll have plenty of off-the-shelf options when you're ready to stack decibels. Steel construction means it'll handle thousands of rounds, suppressed or bare.

Key Features

• 1/2 x 28 RH thread pitch—standard 9mm suppressor threading
• 4.3-inch barrel length for compact P320 models
• Steel construction built for durability and precision
• Drop-in replacement design—no gunsmithing needed
• Includes thread protector cap
• Compatible with P320 Compact, Sub-Compact, and Carry (non-LCI variants)

Specifications

Frequently Asked Questions

Will this barrel fit my P320 Compact or Carry model?

Yes—this barrel is compatible with P320 Compact, Sub-Compact, and Carry models in both X and non-X variants, provided your gun does not have a loaded chamber indicator (LCI). Check your manual or contact Sig if you're unsure whether your specific model has an LCI.

What suppressor thread pitch does this barrel use?

The barrel features a 1/2 x 28 RH (right-hand) thread pitch, which is the standard for 9mm suppressors and muzzle devices. This gives you broad compatibility with commercial suppressor options.

How do I install this barrel?

Unload your firearm, remove the slide from the receiver and grip module, and slide out the existing barrel. Insert the new barrel in its place. The P320 platform is designed for easy, tool-free swaps—no gunsmithing required.

What's included with the barrel?

The barrel comes with a thread protector cap to cover the muzzle threads when you're not running a suppressor or muzzle device.