This full-sized replica uses propane and gasoline to shoot tennis balls at dangerous mutants, watermelons, and concrete blocks.
Jairus of All got a request from a fan to build a full-sized Broadsider – the handheld antique naval cannon from Fallout 76. In the game, it shoots one pound cannonballs and can deal high amounts of damage with a decent level of accuracy. This real-world version is made of PVC and a steel-frame. It can fire tennis balls with a bit of combustible help.
The entire thing was made with readily available materials and tools. The build videos
also provide some pointers that folks wanting to build a canon replica may find useful.