Sig Sauer Caliber X-Change Kit 9MM P320-M18 Coyote 3.9″ 3x Mags 8900268

Sig Caliber X-Change Kit  P320-M18 Coyote 3.9″ 8900268 Details

M18 Caliber X-Change Kit, 3.9″ configuration.
This kit converts a P320 to a non-manual safety version of the renowned M18.
The M18 was recently issued to all branches of the U.S. Military and was chosen as the official sidearm of the U.S. Marine Corps. The P320-M18 is the commercial version that brings the same unprecedented accuracy, extreme reliability and unmatched durability the military demands.
(1) 17rd & (2) 21rd Magazines

*Note, only for use on 9mm/ .357SIG / .40S&W fire control units (FCU). It will not function with a .45 ACP and 10mm FCU.

Learn more about SIG SAUER conversion kits for the P365 & P320.

Specifications

The Sig Caliber X-Change Kit P320-M18 Coyote 3.9″ 8900268 is a premium upgrade kit designed to transform your SIG Sauer P320 platform into a more versatile, mission-capable system. Built around the rugged and proven M18 footprint, this caliber conversion kit makes it easy to switch between calibers quickly while maintaining reliable performance and familiar ergonomics.

Chambered in a highly practical size with a 3.9″ barrel, the X-Change Kit strikes an ideal balance between compact concealability and controllable performance. The Coyote finish not only enhances the aesthetic appeal of your pistol but also delivers corrosion resistance and wear protection for daily carry and duty use. Whether you’re running a backup defensive pistol or configuring a multi-role carry system, this caliber conversion gives shooters the flexibility to adapt to a wide range of operational needs.

Constructed with SIG Sauer’s exacting manufacturing standards, the kit features a precisely engineered slide assembly and barrel that work seamlessly with the P320-M18 series frame and fire control unit. The result is a consistent, drop-in fit that retains factory-level reliability while expanding your handgun’s capability.

The M18 platform is known for its durability and ease of maintenance, and this X-Change Kit builds on that reputation. With intuitive takedown and reassembly, shooters can switch calibers at home, in the field, or on the range without specialized tools or gunsmithing expertise. This makes it an excellent option for competitive shooters, instructors, and everyday carriers who appreciate adaptability.

Perfect for those who want to maximize the utility of their P320 lineup, the Sig Caliber X-Change Kit P320-M18 Coyote 3.9″ 8900268 combines SIG’s legendary reliability with the freedom to tailor your pistol to your mission. Whether you’re optimizing for concealed carry, training, or duty carry, this conversion kit offers a dependable, precision-built solution that enhances performance and flexibility.