New Zealand is one.
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.