You and I have both been around long enough to recall SIG having different QC /specs for certain contract p22x series guns vs commercial and generic agency purchase guns.
DHS contract 229s worked but the NJ State Police had to sue SIG over 229s of similar vintage that didn’t.
We have over 10k 320’s in service and fire millions of rounds through them without any OOB incidents I’m aware of. We’re likely the largest 320 users outside the DOD. But we also only use 320’s with our specific SKU.
So maybe more of an execution / tolerance problem than a design problem.
I can tell you we’ve had enough problems with P365 series guns that we went from allowing any P365 series (commercial or LE/IOP sourced) to only allowing LE/IOP sourced guns even with mandatory armorer inspections prior to being put into service.