Sig Sauer P320 M18 X-Change Kit 9mm Luger Handgun - Coyote Tan (Model 8900268)

The Sig Sauer P320 M18 X-Change Kit in Coyote Tan gives you the same combat-proven platform that earned its place as the official sidearm of the U.S. Marine Corps and across every branch of the U.S. Military. This 9mm Luger X-Change Kit converts a compatible P320 fire control unit into the M18 configuration, delivering the accuracy and reliability the military demands in a commercial package built to the same exacting standard. The 3.9" barrel strikes a balance between shootability and concealability, making it equally at home on the range, in duty rigs, or as a serious self-defense tool.

The M18 platform has earned its reputation through real-world combat testing and military adoption. You get Sig's legendary build quality, a non-manual safety design refined through military service, and the confidence that comes with choosing what professional operators trust. The Coyote Tan finish isn't just aesthetics—it's practical, subdued, and built to handle hard use in the field.

What makes the X-Change Kit system work for shooters is modularity. This kit is designed for 9mm/.357 SIG/.40 S&W fire control units, so compatibility matters before you buy. You'll receive one 17-round magazine and two 21-round magazines, giving you solid capacity options whether you're running drills at the range or carrying on duty. Keep in mind this kit requires a compatible P320 FCU—it won't work with .45 ACP or 10mm units.

What's Included

• M18 X-Change slide and barrel assembly (3.9" configuration)
• One 17-round magazine
• Two 21-round magazines

Key Features

• Military-grade platform adopted by U.S. Marine Corps and all service branches
• Non-manual safety design for consistent, intuitive operation
• 3.9" barrel optimizes sight radius and handling
• Durable Coyote Tan finish designed for hard use
• Modular X-Change system for customization and configuration flexibility

Specifications

Frequently Asked Questions

Will this P320 M18 X-Change Kit work with my fire control unit?

The M18 X-Change Kit is compatible only with 9mm, .357 SIG, and .40 S&W fire control units. It will not function with .45 ACP or 10mm FCUs. Check your current P320 FCU caliber before ordering to ensure compatibility.

What magazines come with the kit?

You receive one 17-round magazine and two 21-round magazines. This gives you flexibility for different carry preferences and range sessions.

Is this the same M18 used by the military?

This is the commercial version of the M18, built to the same standards as the platform adopted by the U.S. Marine Corps and all U.S. Military branches. It brings the same design philosophy, accuracy, and reliability to civilian shooters.

Can I use this kit to build a complete P320 handgun from scratch?

No. The X-Change Kit is a conversion assembly that requires a compatible P320 fire control unit. You'll need an existing 9mm/.357 SIG/.40 S&W P320 FCU to use this kit.