One of England's offshoots starts to act like its parent

We are eternally grateful that we don't live in a place like New Zealand, where after a tragic shooting incident there that resulted in the death of a police officer the police have unilaterally decided to reclassify all semiautomatic firearms that happen to have a pistol grip as "military-style semi-automatic weapons", and have ordered residents to either update their gun licenses, with all of the concomitant headache-causing paperwork and exorbitant fees that go along with that process, or else turn them in:

"Gun owners have been told that if they own a semi-automatic firearm with a "military pattern, free-standing pistol grip'', it is now considered a military-style semi-automatic firearm.

Owners must undergo more stringent vetting than for standard A-class endorsed licences and are required to have a more secure safe for weapons, costing upwards of $1000." (Emphasis mine)

Do the cops there in fact have the authority to make such a decision entirely on their own? No, say law-abiding New Zealand gun owners, some of who have filed a court action to stop the arbitrary relabeling of their firearms. They quite reasonably point out that these new harsher restrictions on their freedoms wouldn't have stopped the suspected shooter from committing his crime because the cops themselves didn't even bother to contact the man after his current license had expired:

"Mr. [gun auction site owner Mark] Fogarin said no check was made after [alleged killer Jan] Molenaar's licence expired to ensure he no longer had guns"

So an unlicensed gun owner appears to have committed a crime with his now-illegal firearms, and the first thing the cops do is go after the licensed ones?

We'd be pretty hot if we were Kiwi gun owners as well. After all, what's the point of making everyone get a license if the "authorities" aren't even going to keep track of who's obeying the law by renewing them?