算criminal negligence是不过分的（Here are some common examples of criminal negligence: Firing a gun into the air at a party. Leaving a loaded weapon in reach of a child. Swiping at a loaded weapon in someone's hand.）

至于惩罚多严，要看具体情况。就算没出啥事，如果法官愿意，肯定可以罚的比没收枪要严的多。