The Arms Code or Arms Manual is a firearms safety manual compiled by the New Zealand Mountain Safety Council and the New Zealand Police. You can download a PDF version of the Arms Code. It is also available free at all Police stations.
The text of the code is in the first link. NZ Mountain Safety Council website has other material on handling of guns in the bush.

Websites
NZ Police Firearms Code - http://www.police.govt.nz/service/firearms/arms-code.pdf
NZ Mountain Safety Council - http://www.mountainsafety.org.nz/