its already been done. http://www.thehomegunsmith.com i built one of those (quite a bit more involved then a spud gun but still fun). i cant post pictures for obvious reasons but there are a few on the website.

here they are, same basic design as the others. these were built for more of my friend and are the last i will build before finishing my prop injected one. i would love to build more but i am moving to Okinawa japan in a few days. i wonder if they have anywhere to buy supply's there?

i just bought the parts to make the largest one propane injected. will it still work well with the grill igniter as long as i use a fan?

the art was done with stencils (i do alot of art in my free time so it kinda just carried over into this) the Betty stencil started out on the short black one (black Betty) and i just decided to use it on the other cannons as sort of a camo effect. the tall one is mine, the med one is my brothers an...

just some quick pictures of some cannons i made recently the two larger ones are breach loading with a grill igniter the small one has a lantern lighter and has a fixed breach