There are almost 250,000 licensed gun owners in New Zealand, which has a population of 5 million.
She said she expected the program could cost the country between $NZ100 million ($96 million) and $NZ200 million ($192 million).
It is understood that an amnesty period will apply and a buy-back scheme will be detailed soon.
The company's Managing Director, Greg Ward said, "We have a zero-tolerance policy for the inappropriate use of social media, and as a result this individual was immediately terminated and turned over to the authorities to face justice".
"I can assure people that there is no point in applying for such a permit", Ardern said.
Suspect in Utrecht shooting admits guilt to judge, prosecutors say
Police forces and emergency services stand at the 24 Oktoberplace in Utrecht, on March 18, 2019 where a shooting took place. He appeared before a magistrate behind closed doors and was expected to be remanded in custody for a further two weeks.
"While we have sold them in the past to a small number of customers, last week's events have forced a reconsideration that has led us to believe such weapons of war have no place in our business - or our country", CEO Darren Jacobs said in a statement.
In the interim, New Zealand Governor General Patsy Reddy has signed an order to reclassify some semi-automatic weapons as "military-style". "We are announcing action today on behalf of all New Zealanders to strengthen our gun laws and make our country a safer place", Arden said at a new conference in Wellington, the country's capital.
"Clearly, what has happened here is an extraordinary and unprecedented act of violence", Ardern said in an address to a shocked nation last week.
The move comes less than a week after a white supremacist rampaged through two mosques killing 50 people as they prayed, sparking global revulsion and national outrage.
Imam Gamal Fouda said he is expecting 3,000 to 4,000 people at the prayer service, including many who have come from overseas to be with members of Christchurch's Muslim community and to attend funerals.
Robert Mueller Delivers Russia Investigation Report to Attorney General
While Mueller's investigation is finished, the investigations into Trump, his business and his administration are far from over. Earlier this month, the House voted unanimously for a non-binding resolution to make the report's findings public.
A policewoman is seen as people attend the burial ceremony of a victim of the mosque attacks, at the Memorial Park Cemetery in Christchurch, New Zealand March 21, 2019.
But Ardern's star power has also been met by criticism at home, with New Zealand undergoing a housing crisis and economic woes. A further 50 people were also reportedly injured in the March 15thattacks, 12 of whom remain in a critical condition.
The bullet-riddled Al Noor mosque in Christchurch was being repaired, painted and cleaned ahead of Friday prayers, as grieving families buried more victims. They will bury the blood-soaked carpet. Kawthar Abulaban, 54, who survived the shooting at Al Noor mosque told AFP.
"We've targeted here the guns that are actually doing the harm in our community and we saw that on Friday", Ardern said.
Many came from Cashmere High School, which Sayyad attended alongside fellow victim Hamza Mustafa, a Syrian refugeewho was buried Wednesday.
"Super Lune " de l’année aura lieu cette nuit
Pour rappel, celle d'hier coïncidait à la perfection avec l'équinoxe de printemps, un phénomène qui ne se produit que rarement. Tout d'abord, le phénomène, bien connu, des phases de la Lune dépend d'un alignement entre le Soleil , la Terre et la Lune.
Christchurch United Academy Director Colin Williamson described Omar as "a attractive human being with a tremendous heart and love for coaching".