Sig Sauer P320 Full Size 9mm Luger Barrel, 5.5" Threaded with Chamber Indicator & Protector, Black Steel

The Sig Sauer P320 Full Size 9mm Luger barrel is a factory replacement part built for shooters who demand reliability and precision from their duty or competition platform. This 5.5-inch threaded barrel opens up suppressor and muzzle device options while maintaining the tight tolerances and durability Sig Sauer is known for. Whether you're upgrading from a standard barrel or maintaining a hard-used duty gun, this OEM component gives you the confidence that you're running genuine Sig engineering.

Manufactured to Sig Sauer's exacting standards, this barrel is specially heat-treated for toughness and durability—meaning it can handle the demands of regular shooting without premature wear or failure. The loaded chamber indicator gives you a fast, tactile way to verify a round is in the chamber without racking the slide, a feature that pays dividends in training and defensive scenarios. The Nitron finish resists corrosion and pairs seamlessly with the rest of your P320 frame and slide.

The 1/2x28 thread pitch is the modern standard for 9mm suppressors and muzzle devices, so you'll have no trouble finding compatible accessories. A protective cap is included to keep the threads clean when the barrel is stored or carried without a muzzle device attached. This is a straightforward replacement part—no guesswork, no compatibility surprises. Swap it in and you're done.

One important note: this barrel is engineered for the P320 Full Size slide and frame; it is not compatible with the P320 X-FIVE slide, so verify your platform before ordering.

Key Features

• Factory OEM Sig Sauer replacement barrel for P320 Full Size platform
• 5.5-inch length with 1/2x28 threaded muzzle for suppressors and devices
• Loaded chamber indicator for fast visual and tactile verification
• Heat-treated steel construction for durability and longevity
• Nitron finish for corrosion resistance
• Includes protective cap for threaded muzzle

Specifications

Frequently Asked Questions

Is this barrel compatible with my P320 X-FIVE?

No. This barrel is designed for the P320 Full Size slide and frame only. It is not compatible with the P320 X-FIVE slide.

Can I use this barrel with a suppressor?

Yes. The 1/2x28 thread pitch is standard for 9mm suppressors and muzzle devices. A protective cap is included to keep the threads clean when not in use.

What does the loaded chamber indicator do?

The loaded chamber indicator provides a tactile (and sometimes visual) confirmation that a round is chambered, allowing you to verify condition of the firearm without racking the slide.

Is this an OEM Sig Sauer part or an aftermarket barrel?

This is a factory Sig Sauer OEM replacement barrel, manufactured to the same specifications and heat-treat standards as barrels installed on new P320 Full Size pistols.