if you take apart one of those cylinder bicycle pumps, drill a small hole at the closed end and put a firecracker in that end with a marble in the open end - it makes a pretty fair cannon for your games with your army men.

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the story
    https://1in6.org/men/bristlecone/mark-krueger/

Kirkridge - October 2008
Alta - September 2012
Alta - September 2013