I took a hike up Kennesaw Mountain today, which was a civil war battlefield and they have several cannons up there. I was thinking that it would be fun to own a cannon (or build one), and I have never seen any laws against owning or building a cannon. I would love to haul one to the range and fire it. It seems that some cast iron sewage pipe, some powder, fuse, and a few cans of green beans would make for a great time at the range. Are there any regs on cannons? Anyone own one? I know of a local place that I can purchase them from, but I would rather build one.