I'm posting this in the LE forum since we carry these holsters more than your average guy. I've talked at length in other posts about how I believe a lot of the ND issues with the P320 are due to a combination of the lack of trigger safety (the tab like on a Glock or pretty much every other striker-fired polymer pistol) and the poor interface with Safariland and other modern duty holsters.
I apologize for the garage photos, but my kids are asleep and I didn't want to make a bunch of noise.
The holster is the latest version of the Safariland 7360RDS with the band around it. The gun is a completely stock SIG M18. The round pictured is 45 ACP Winchester 230gr FMJ which I'm using to represent a finger or other foreign object.
The gun is completely seated in the holster with both the SLS and ALS mechanism engaged and the holster has been properly adjusted for the correct tension.
Use your imagination to picture how a ND could happen and keep in mind most LE P320's are not a M18 with a manual safety.
Also keep in mind if there is a foreign object or if it was a human finger likely the object would be gone after the ND and thus the gun would pass all safety/function checks as would the holster.
I'll let the pictures talk:
...and if you think the new Mexican-made 6360RDS series holsters are any better with this I assure you they are not.
Sariland's answer to this is the SafariVault which just came out and is only sort-of available at the moment.