I need Miniature canon designs!?

I'm thinking of making a 6" - 8" canon in metalwork, I'd make my own design but I want it to fire mini ball bearings and I have no clue on requirements. I was thinking of just a barrel with a little hole for a fuse but i think its supposed to be more complicated than that.

10 points if you submit a schematic that would actually fire.
 
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