It looks the ZOXNA mini launcher has competition in the ultra-compact airsoft BB launcher systems. At Airsoft Taiwan right now is the gas-powered HFC HG138 Mini Grenade Launcher. It can be mounted on the underrail of pistols and rifles and has it's own underrail too in case you want to attach a laser there.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
