Instead of having a gimmick rifle with that stuff in the butt or something just be properly prepared with what is in your backpack.
Worst case scenario: you get injured or lost in the NZ bush/mountains somewhere and have to survive while waiting for help (which will be coming eventually because you told someone responsible where you're going and when you will return). So a first aid kit and knowledge of how to use it, shelter and extra layers, means of making fire, some food and water. And an EPIRB.
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