UPDATE: Well, FN determined that ammunition was to blame (no surprise there) and, ultimately, returned the damaged FNX to us. They would not allow the customer to pay for the FNX to be repaired as the kaboom compromised the weapon, but they did offer to sell him a new one for $452. While this is an n of 1 situation, it is my first experience with FN customer service and I am very surprised. But at least they returned the "unsafe" pistol, right?