Note that Sig Sauer no longer includes slide catch levers with caliber exchange kits. If you have an older P320 with the original style grip your existing slide catch lever will not work so you will need to purchase the updated part. Watch our video below for additional information.
P320 Caliber X-Change Kit. The modular P320 allows you to select any of several centerfire calibers. Just disassemble the pistol and reassemble it with the X-Change Kit's barrel/slide assembly, grip module, and magazine.