Sorry missed your earlier post
Airsoft is big in HK? I thought they had very strict guns law there. (granted airsoft is not a real firearm)
Not enough to call it big but certainly not small, the primary law regarding airsoft is simple one: muzzle velocity 2J or below do not require license for ownership; anything above or real firearms require strict license, typically those not use firearms for living need to join the only gun club in HK, the firearm is under lock and key inside the club, not for use outside unless on competition overseas.
That said, most airsoft made in Japan, Taiwan and HK fits the classification (for a time there are made in China too, not anymore since 2008, those survived now OEM components for HK brands, final assembly made in HK, a few HK brands have arms factory made components for them as sell point), and thus legal to own without licensing requirement. You can buy real bayonets if you got the money, same goes for real gun components to mod your airsoft for more "real feel", if you goes to the retailer who got the proper export license in the US or elsewhere. Police won't interfere cosplay event or matches that runs proper and in orderly fashion. Idiots who brandish their stuff in public deserves to be arrested, simple as that.
Some larger gun shops organizes weekend matches, just pay for the couch fare and lunch if you got your own gear.