P365Xl 4.3'' Bbl 9Mm 1/2-28'' Threaded S/S

The Zaffiri Precision P365XL 4.3" threaded barrel is a match-grade drop-in upgrade for shooters looking to add suppressor capability to their Sig Sauer P365XL carry pistol. Made in the USA from 416R stainless steel, this barrel combines precision manufacturing with practical features—a polished chamber and bore that reliably cycles lead, plated, and jacketed ammunition without fuss. The 1/2-28 muzzle thread accepts standard suppressors and pistol brakes, while the included thread protector keeps the threads clean when running unsuppressed. At 4.3 inches, it preserves the compact handling that makes the P365XL popular for concealed carry and home defense.

Zaffiri barrels are known in the community for tight tolerances and attention to detail. This one features a fully supported chamber—a upgrade over OEM P365XL barrels—and an improved feed ramp design to ensure reliable function. The barrel is stress-relieved and heat-treated to RC 40-42 hardness, broach-cut rifling with a 1-in-10 left-hand twist, and a target crown that contributes to consistent shot placement. The oversized lockup area and SAAMI-spec chamber mean it's engineered to drop in without fitting, and it'll handle the full range of modern 9mm loads.

Keep in mind that threaded barrels are regulated differently in various jurisdictions—some states and localities restrict or prohibit them entirely. Before ordering, verify that a threaded barrel is legal where you shoot and carry. If you're in a restricted area, Zaffiri also offers a non-threaded version of this barrel.

Key Features

• Match-grade precision manufacturing, Made in the USA
• 416R stainless steel construction, stress-relieved and heat-treated to RC 40-42
• 1/2-28 threaded muzzle for suppressor and brake compatibility
• Fully supported chamber with improved feed ramp design for reliable function
• Polished chamber and bore for consistent performance with all ammunition types
• Target crown for accuracy
• Broach-cut 6-groove rifling, 1-in-10 left-hand twist
• Drop-in replacement for P365XL—no fitting required
• Thread protector included

Specifications

Frequently Asked Questions

Is this barrel legal where I live?

Threaded barrels are prohibited or heavily regulated in many states and municipalities. It is your responsibility to verify that a threaded barrel is legal in your jurisdiction before purchasing. Check with your local law enforcement or legal counsel if you're unsure.

Will this barrel work with my P365XL?

Yes, this is a drop-in barrel designed for the Sig Sauer P365XL. It requires no fitting and replaces the factory barrel.

What's included with the barrel?

The barrel ships with a thread protector to cover the muzzle threads when running without a suppressor or brake.

Can I use this barrel with all types of 9mm ammunition?

Yes. The polished chamber and bore are designed to function reliably with lead, plated, and jacketed bullets.