Hahaha, Fancy Schmancy "Bird Bomb" on wheels! We have "Bird Bombs" around here, though extremely hard to get, basically a starter gun that launches an M-80 several hundred feet before it blows up, just the thing for those pesky Starlings and other tree robbers that eat all your crops! Oregon is world famous for it's berry crops, Blue Berries and especially Marion Marries, and a few hundred birds can wreak havoc on a crop, thousands of $$$$ in losses per day, so something needs to be done, walla, Bird Bombs, which don't kill that many of the little buggers, and usually keeps them out, but are only good for a hour or two at most, till the next big flock shows up! The alternate is a .12 shotgun, which my brothers, cousins and I would use to rampage those fields daily, to the tune of a case or "Flat" of shotgun shells per day, or more, but we absolutely murdered entire flocks, and the occasional crow or three who happened to show up! A single day worth of shooting birds would fill a 55 gallon drum completely, and usually required a second drum, which was doused in kerosene and burned! Bird Bangers Bird Scaring Pyrotechnics | Sutton Agricultural Enterprises, Inc.
Get yourself a 5 ft metal fence post and a bunch of bottle rockets ,, get your A gunner to load and light the rockets while your aiming,, get a cooler full of beer ,, and have a blast . You might could get an even better aim with a piece of 1/2 , or 3/4 conduit. But that's a neat little Howitzer there .
We used to take the plastic tubes from golf bags and cut a slot in the side, load the bottle rocket in and hang the fuse in the slot. Light, point and fire. Pretty accurate. I miss bottle rocket wars. It's a wonder we have any eyes left. Like to have one of those little cannons though.
Really,,, I'll have to go looking for one of them,,I'm assuming they'd be in the sporting goods section. If my local Wally store has 1,, I'll let you know.