The law also created the new category of "military-style semi-automatic

Special restrictions applied to restricted weapons and pistols, which needed to be registered. Self-defence was no longer a valid reason to have a pistol (Although the Crimes Act 1961 states a person can use "reasonable force" to defend ones self and/or property and nowhere in this act states a person cannot use a firearm for such purposes while the arms act does not mention "directly in words" one cannot use a firearm for self-defence) but the new sport of target pistol shooting has become more popular and pistol club shooters can own pistols with a special "B" endorsement.
Aramoana and the 1992 Amendments

After the Aramoana massacre in November 1990, John Banks, the Minister for Police, announced that the government would ban what he and others described as "Rambo-style" weapons and substantially tighten gun laws generally. The law was eventually passed in 1992 and required written permits to order guns or ammunition mail-order, restricted ammunition sales to firearms licence holders, added photographs to firearms licences, required licence holders to have secure storage for firearms at their homes (which would be inspected before a licence was issued), and controversially required all licence holders to be re-vetted for new licences which would be valid for only 10 years.

The law also created the new category of "military-style semi-automatic", which like the Federal Assault Weapons Ban two years later in the United States, mainly covered the appearance rather than the functionality of the guns. These required a special endorsement, security and registration in the same manner as pistols, but could be used wherever A-category guns could.
The Thorp Report to today

After two shootings by police in 1995, the government ordered an inquiry into police procedures for storing and using firearms. Before the review started, massacres overseas at Dunblane and Port Arthur led the government to expand the scope to gun control generally. The police reported that the system was sound and that no major changes were needed.