"It would most likely fall under a the definition of a prohibited firearm, under the same category as any weapon of whatever description designed or adapted for the discharge of any noxious liquid, gas or other thing."
Eh, no more so than one of these.
One presumes these will not be mail-order and the company will sell it along with training to genuine buyers, in which case the Police would be unlikely to take too great an interest.
Biting the hand that feeds IT
