New Zealand has no cause to allow semi-automatic weapons in the country as they were invented to kill more people more quickly.
As a retired army officer I saw devastating results in my time in Vietnam when such a weapon was in the hands of someone who suddenly lost it.
Some years ago I was roundly criticised by the gun lobby for publicly calling for all guns to be removed from being held in private residences and being secured in central armouries administered by the police.
This did not stop use as they could be drawn out and used for duck/rabbit shooting purposes at any time and then returned to a secure armoury. This meant at any one time there was a record as to who was in the community with a weapon.
The gun lobby was opposed to such a move, but as it seems ridiculous that a license allows ownership of many weapons how is it possible to know how many firearms are in New Zealand.