香港如何管制市民管有槍械如氣槍?

1. You have mixed up 2 things together.

In many countries (including Hong Kong), airsofts are not regulated as they are not considered as firearms as soon as they have met certain requirements.

For example, in Hong Kong, as soon as the firepower of the airsofts do not exceed 2 Joule, Hong Kong Police will not have authority to regulate.

In Hong Kong, virtually no person can own firearms, as even a permit is issued, the firearm can be stored at a designed location (like gun clubs).

2. Simple - to fight and to kill.