Yes, Sig Sauer will replace every P320 trigger, sear, and striker assembly in the wild. In addition, every slide and frame in every caliber must be machined to fit the new parts. This will be a huge task and nightmare, considering SIG states there are over 500,000 P320s shipped, with an unknown number of caliber exchange kits and spare grip modules out there. SIG outlines a three-step process for the upgrade. Go to SIG's Voluntary Upgrade page and enter your P320 pistol serial number.Register your upgrade request with SIG.Wait for SIG to get back to you. According to SIG, there...