Sig Sauer P320 Full Size X-Change Kit .40 S&W Black - CALX320F40BSS

The Sig Sauer P320 Full Size X-Change Kit in .40 S&W gives you the flexibility to shoot multiple calibers from a single platform you already trust. If you've committed to the P320 as your duty, competition, or range gun, the X-Change system lets you swap calibers by simply swapping the slide and barrel assembly, grip module, and magazine. It's a practical way to run different loads without buying an entirely new pistol—or to find the caliber that works best for your shooting style and needs.

The modular design is the whole point: you keep the fire control group and internal parts that define the P320, and only exchange the upper and lower components. That means less gear to maintain, easier logistics if you shoot multiple matches or drills, and real economy if you want to explore caliber options. All Sig X-Change kits come with a Medium grip frame, so sizing is standardized and straightforward.

One important note: this kit is not compatible with P320 models equipped with a manual safety. Confirm your gun's frame configuration before ordering. If your P320 Full Size runs the standard safety-less or decock-only trigger, you're set to go.