Moves by police to close a potential loophole in the gun buying rules was a "sensible step", Prime Minister John Key says.
The police tightening of its rules came yesterday, after they launched a criminal investigation into the purchase of a .22 rifle online by MediaWorks journalist Heather du Plessis-Allan using false details online.
A review into the processes around firearms licensing had been looking at online or mail-order firearms buying rules since January.
Today, Mr Key welcomed the police reaction to du Plessis-Allan's TV show sting.
"At this stage that was a sensible step," he said.
The police review is ongoing.
And further changes cannot be ruled out, Mr Key said.
"We take the use of firearms and the ownership of them very seriously. Primarily because we know tragedies can take place if they are not appropriately handled, stored, used, or if they fall into the wrong hands."