New Zealanders have handed more than 10,000 guns, weapons parts and accessories in the first week of a buy-back plan prompted by the country's worst peacetime mass shooting, police figures released Sunday showed.

A gun reform law passed in April banned most semi-automatic firearms, parts that convert firearms into semi-automatics, magazines over a certain capacity and some shotguns.

Owners have until Dec. 20 to hand in their weapons and the government has set aside 208 million New Zealand dollars ($140.6 million) to compensate them for up to 95 percent of the original cost.