Congrats on the pistol. Is yours using the DAK operating system? I don't see an exposed hammer in the rear.
i have P227 and P228/M11A1 (45ACP and 9mm, respectively) but they have the hammer and operate DA to SA with decocker. Your does share a rear end with my P320 which is a striker fired gun. And, good to see you went for the 357SIG "upgrade".