Congratulations on a Great Addition to the family
The P239 is a fantastic platform, especially for the 357SIG cartridge.
All of mine are chambered for the 357SIG
I have countless tens of thousand of 357SIG rounds down range with my SIGs going back to the mid 1990s
I do have a factory threaded 9mm barrel on hand so I can use any of my P239s as a suppressor host when I desire
SIG handguns chambered for the 357SIG cartridge have been the issued sidearms of the Texas Department of Public Safety (both Highway Patrol and Texas Rangers) along the the Secret Service and the Air Marshals service for many years.
BTW, in case you have not noticed, I am a BIG fan of the 357SIG cartridge, especially for the Highway
Patrol role