A bill outlawing most automatic and semi-automatic weapons, and components that modify existing weapons, was passed by a vote of 119 to 1 in April.
However, others began stockpiling weapons and ammunition that would soon be banned, and numerous gun clubs and hunting associations have criticised the buyback scheme, saying the compensation offered was paltry and the majority of law-abiding gun owners should not be penalised for the actions of one individual.
Despite more than 1 million guns in circulation in New Zealand, police and gun control advocates say they're happy with the progress.
The nation banned semi-automatic weapons after the July 13th incident, where a 28-year-old Australian man killed 51 people and injured many more.
In the days and weeks following the worst massacre in New Zealand's modern history some firearms owners voluntarily handed in their weapons, citing disgust at the carnage they had caused on 15 March.
Meanwhile, there is growing opposition from New Zealand's pro-gun groups.
"We expected, based on what the Australians told us of their own [gun buyback] experience in the mid-1990s, that we would get a surge at the start, a lull in the middle, then another surge at the end", Deputy Commissioner Clement said. Owners can bring in their guns until December 20.
Armed police respond to a shooting Friday at the Masjid Al Noor mosque in Christchurch, New Zealand.
She called on her members this week to keep their weapons until the government came up with better compensation.
In June, the former chair of the Council of Licensed Firearm Owners, Paul Clark, told Radio New Zealand that gun owners felt aggrieved.
"Honestly, people just feel they are being made to carry the can for an event they had nothing to do with and didn't want to happen anyhow. they are just seen as the easy scapegoats for our system, "he told RNZ".