Here is the text of the law under "Prohibited Devices":
12. A firearm made up in the form of a stylographic or propelling pen or pencil, capable of being used for the discharge of gas, bullets, shot, dye or pyrotechnic flares.
13. A firearm capable of discharging by any means (a) any irritant matter in liquid, powder, gas or chemical form, or (b) any pyrotechnic flare or dye,
HOWEVER, paragraph 14 covering "canons"does exempt a Very pistol.