Even suppressors now require the approval of police to mail order in NZ
Google has this gem of intelligence re this...
"Are suppressors legal in NZ?
Suppressors, more commonly known as silencers, are completely unrestricted for sale in NZ. While some may claim they are necessary safety equipment, their criminal applications outweigh the need for legitimate use, especially considering in ear protection is much more efficient in preventing hearing damage.28/03/2019"
Oddly I need it for hunting, a few seconds on Trademe. NZ's rip off of Ebay every third bolt action rifle has one attached or is threaded for such an attachment.
Laws are created by delusional's, fearful of of things they don't understand... Yet they want gun owners to have background checks for mental stability.