SIG does claim to provide higher levels of QC to LE program guns.
However:
If the agency has an armorer, and the armorer is on site, the SIG 320 armorer school is only a 1 day detail stripping class. A pre-service armorer inspection of a 320 doesn't even involve detail stripping the FCU. The benefits are minimal other than the ability to swap broken parts or do PMCS.
You would get the same level of support from a local gunsmith or SIG customer service.