On Monday, police searched two homes in Australia near where he once lived.
Last year, he vowed to take court action against police after a denied import application for semi-automatic rifles and parts.
Police Commissioner Mike Bush said the body of the 50th victim was found at the Al Noor mosque, where more than 40 people died after a gunman entered and shot at people with a semi-automatic rifle with high-capacity magazines, before traveling to a second mosque.
"We can't ignore the galling fact he came to New Zealand to buy firearms he couldn't get in Australia", Police Association president Chris Cahill said.
"As a Cabinet we were absolutely clear, the terror attack on Friday (March 15) was the worst act of terrorism on our shores", she said.
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On Monday, Ardern made good on her pledge, and met with her cabinet to begin the process, announcing an "in-principle decision" to reform gun ownership laws in New Zealand.
Members of the Muslim community and police were at a cemetery which has been fenced off and obscured with white netting.
New Zealand's firearm laws have remained largely unchanged since 1992, though subsequent government reviews have called for reforms.
Morrison says religious freedom has to start with the right to worship and meet safely without fear of violence.
Amid the sadness, there have also been tales of heroes such as Alabi Lateef and a fellow worshipper, who followed the 28-year-old Australian gunman to his auto and used a discarded rifle to smash the vehicle's back window.
In Sydney, a silver fern - the symbol of New Zealand - was projected onto the side of the world famous Opera House.
A New Zealand standard A-category firearm licence is issued after a police and background check.
Tarrant was seen smirking and giving a white supremacist sign as he was charged with one count of murder on Saturday.
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Police said in a statement the raids occurred in the towns of Sandy Beach and Lawrence early on Monday. While authorities termed it as an act of terror, Tarrant said his act was to 'defend our land from invaders.' He has since sacked his lawyer, reported New Zealand Herald.
Gun City owner David Tipple said the alleged gunman bought four weapons and ammunition between December 2017 and March 2018.
Asked if he felt any sense of responsibility for Friday's tragedy, Tipple said: "No, I do not".
Referring to the man arrested after the shootings at two mosques, Tipple said, "We detected nothing extraordinary about this (gun) license holder".
The alleged shooter was formally charged with murder over the weekend.
Mass shootings and violent crime are rare in New Zealand, a country of almost 5 million people.
It is customary in Islam to bury the dead within 24 hours but no bodies have been released because of the investigation, police said.
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Rashid worked with a private bank in Pakistan before he moved to Christchurch to work as a teacher. His 21-year-old son Talha Naeem is also among the 50 people who lost their lives.