This “thing” is about 4 feet long  (you can see the water bottle just below it), is cast iron, rusted and HEAVY!  It has what appear to be a trigger and sights.  We found it last winter while clearing some brush at the Nature Park.  Some have suggested that it’s a potato launcher ( no, too old, and heavy for the industrious 13 year old who might make one of these).  We believe it may be a bazooka but cant figure out how if would have gotten into the Nature Park.  Any ideas?