I would get two air tanks that can hold 1-2 hundred pounds air. Hook to back of pipe with a quick open valve. Fill pipe with some kind of debris like rocks, small metal scraps, or anything else that would do damage. Keep em loaded and pointed in the right direction and have pails full & ready to reload. After the 1st shot you may not need to use the 2nd. More than 1 way to skin a cat.
I would get two air tanks that can hold 1-2 hundred pounds air. Hook to back of pipe with a quick open valve. Fill pipe with some kind of debris like rocks, small metal scraps, or anything else that would do damage. Keep em loaded and pointed in the right direction and have pails full & ready to reload. After the 1st shot you may not need to use the 2nd. More than 1 way to skin a cat.