If the Police want that, and at this stage I would bet nothing has been formulated/clarified that would leave hundreds, no thousands of firearms in NZ needing their serial numbers "touched" up due to not being "deep" enough, or worn due to corrosion.
Plus numbers punched or pneumaticaly engraved even though removed by crims for example can still show up under xray so desired outcome achieved.
And the subject of a deactivated firearm in NZ is that virtually no such thing exists and in the eyes of the police they are still firearms. Although having said that @gundoc posted something way back around 2018 stating the steps (machining etc) required to create such a firearm. The steps were quite extensive.
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