Marshmallow Bazooka

This device uses a PIC12F629 to create a burst of 30 high voltage pulses.  The PIC activates a 1000 volt N-Chan FET driving a standard ignition coil.  After the ignition, the PIC goes dormant until activated again.  Most of the electronics, including the battery and momentary switch are located in the handle.
Unscrewing the coupling to the barrel allows the (high carbohydrate) projectiles to be breach loaded.  Unscrewing the rear fitting access the main chamber to inject the propellent (I've been using lighter fluid in a nasal inhaler bottle - really works great!).

Coating the marshmallows with flour keeps them from sticking in the barrel and improves performance.  Watch out when they get a bit stale, they really come flying out then and may go several hundered feet.

Don't forget to 'air out' the chamber between firings, or you won't get any real action.

Here are the SOURCE and OBJECT files.