Ahh, but Woodsman, a Flak cannon is easy to build.  All you need is a metal pipe that's open at only one end and a live hand grenade.  Of course, loading is manual, as is firing, which has an approximate delay of 3 to 5 seconds, so it's a bit primitive.  It should also be noted that surviving the weapon's initial firing is another issue... for the user, that is.  :ph34r:   
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