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Police were called to the airport on Sunday afternoon after the passenger tried to legally check a disabled firearm in his luggage on a domestic flight.
But officers also discovered two live rounds of ammunition "inadvertently left" in a magazine, a police spokeswoman told the NZ Herald.
"A firearm had been legally checked in and had been made inoperable for transport on a domestic flight.
"Around 12.30pm during screening a possible round was seen, and Airport Police attended.
"Police checked the luggage and found two rounds had been inadvertently left in a magazine (not in the firearm itself).
"The rounds were confiscated and police spoke with the owner to remind them of requirements around transporting firearms."
The spokeswoman said despite a firearm and live ammunition being found, armed police did not respond to the incident because "the firearm was not 'with' anybody, it had been checked in".
No further action was required.