The Sig Sauer P320 Full Size X-Change Kit in .357 Sig lets you convert your P320 platform to a completely different caliber without buying a whole new gun. If you've committed to the P320 as your duty, competition, or duty pistol but want to explore what .357 Sig brings to the table—superior velocity, flatter trajectory, and harder-hitting energy—this modular kit gives you that flexibility. The X-Change system is one of the smart innovations that made the P320 a favorite among serious shooters, and this .357 Sig configuration makes it easy to add another caliber to your arsenal.

Switching calibers is genuinely simple: disassemble your P320, swap in the X-Change kit's slide and barrel assembly, install the included grip module and magazine, and reassemble. No gunsmithing, no special tools beyond what you already use to field-strip your pistol. The modular design means you're not locked into one caliber—your P320 frame becomes the foundation for multiple shooting roles, whether that's range training, competition, or carry. All X-Change kits ship with a medium grip frame, so sizing is consistent across configurations.

One important note: X-Change kits are not compatible with P320 models featuring a manual safety, so verify your frame configuration before ordering. If you're running a standard P320 Full Size without the safety, this .357 Sig kit opens up a caliber option that delivers more stopping power and flatter shooting characteristics than 9mm, with factory ammo readily available.

The Sig Sauer P320 Full Size X-Change Kit in .357 Sig lets you convert your P320 platform to a completely different caliber without buying a whole new gun. If you've committed to the P320 as your duty, competition, or duty pistol but want to explore what .357 Sig brings to the table—superior velocity, flatter trajectory, and harder-hitting energy—this modular kit gives you that flexibility. The X-Change system is one of the smart innovations that made the P320 a favorite among serious shooters, and this .357 Sig configuration makes it easy to add another caliber to your arsenal.

Switching calibers is genuinely simple: disassemble your P320, swap in the X-Change kit's slide and barrel assembly, install the included grip module and magazine, and reassemble. No gunsmithing, no special tools beyond what you already use to field-strip your pistol. The modular design means you're not locked into one caliber—your P320 frame becomes the foundation for multiple shooting roles, whether that's range training, competition, or carry. All X-Change kits ship with a medium grip frame, so sizing is consistent across configurations.

One important note: X-Change kits are not compatible with P320 models featuring a manual safety, so verify your frame configuration before ordering. If you're running a standard P320 Full Size without the safety, this .357 Sig kit opens up a caliber option that delivers more stopping power and flatter shooting characteristics than 9mm, with factory ammo readily available.