A few years ago, a friend took me to a firing range near Dunedin, and I watched someone fit a suppressor to an AR15 style weapon.
New Zealand firearms regulations are incredibly tight. I never verified this, but I'm told that this particular AR15 was licensed and restricted to be used by him alone. His wife was also a shooter, and if she wanted to shoot an AR15, she would have to buy her own otherwise she would be committing a firearms offense.
On the other hand, I was also told that if I wanted a firearms license and the endorsement to allow me to own pistols, I would need to be a member of the pistol club, shooting regularly for six months, before I could apply for the endorsement. However, I could also apply for my firearms license AND the P endorsement on the same day, having been a regular shooter at the range beforehand.
One reason behind the strict regulation of firearms in New Zealand is the Aramoana massacre from November 1990. David Gray, who owned several military-style firearms, used these weapons to murder a number of people over the course of two days before finally being killed by police.
Our laws are based around the idea that a gun can be owned for hunting or collection but not self defence. So restrictions are in place to restrict pistols and automatic weapons to gun clubs and hunting weapons still require a license. The license requires you to pass a gun safety test and a background check. Then a police officer will inspect you have a secure cabinet to store the gun in.