This SIG Sauer factory replacement barrel (SIG part number 8900566) fits the P320 Full-Size and is chambered in 9mm Luger with a 5.5-inch threaded muzzle. SIG Sauer machines it with a cut for the P320’s loaded chamber indicator, so the factory LCI function keeps working after installation, and every barrel is specially heat-treated for toughness and long-term durability. The 1/2-28 RH thread pattern is ready for a suppressor or other muzzle device without any additional machine work. This barrel is not compatible with the P320 X-Five slide, so confirm your slide model before ordering.

Key Specifications

• Chambered in 9mm Luger.
• Barrel measures 5.5 inches in length.
• Threaded at 1/2-28 RH for a suppressor or muzzle device.
• Machined with a cut for the loaded chamber indicator.
• Fits the P320 Full-Size.
• Specially heat-treated for toughness and durability.
• Genuine SIG Sauer factory replacement part.
• Not compatible with the P320 X-Five slide.

Frequently Asked Questions

Does this barrel work with the loaded chamber indicator? Yes, it is machined with the correct cut for the P320’s LCI.

What thread pattern does it use? 1/2-28 RH, ready for a suppressor or muzzle device.

Will this fit a P320 X-Five? No, this barrel is not compatible with the P320 X-Five slide.

Buy the SIG Sauer P320 Full-Size 9mm Threaded Barrel

Add suppressor readiness to your P320 Full-Size with a genuine SIG factory barrel. Order this SIG Sauer barrel from our handgun barrels lineup, shipped fast from our Lubbock, Texas gun shop.