After some searching on this topic I found heated discussion about it being 'Police policy' not legistation, and links to the police official decision on their website has since been removed.
Check these links on the bottom of this page and the last page of this thread.
https://kiwigunblog.wordpress.com/20...-policy-again/
https://www.nzhuntingandshooting.co....62/index5.html
I also found a letter of legal opinion from Nicholas Taylor so this policy may have been challenged post the court case that the accused was found guilty. Its a pdf so I cant share it here but it comes up in google.
I cant see any changes made to the arms act so I think just maybe the policy never got traction.
Interestingly my arms officer relayed this method of measuring oal to me so I will go back to him and ask for the reference to actual law stating this.
Great news if they pulled their heads in as I can make a much better Delisle suppressor with the shorter barrels
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