Watch step by step as I build a bait cannon with a 5' barrel and test fire it with a 1.5" ice ball. Catch More Fish! I built this with interchangeable barrels and air chambers for maximum versatility. With this design you can make a spud gun, tennis ball launcher, bait gun for fishing or just about anything you can think of that you may want to launch. I built this mainly for fishing, but wanted to make it so I could launch just about anything. This Fish bait launcher will shoot a bait ice slug about 150-200 yards!
Air Power rocks! This air cannon has insane power, watch as the ice ball smashes through a 1/2" OSB board. Check it out at 12:08

Parts:
T-Saddle: https://amzn.to/2MUlfDj
Rainbird Valve: https://amzn.to/2Ng4st3
2" Tee: https://amzn.to/2MQE8Xt

Watch the video on modifying the sprinkler valve here:
https://youtu.be/dkQYgDz8-KE

You can read the complete Article and down load a revised (and accurate) parts list and diagrams here:
https://extremediy.org/build-bait-cannon-spud-gun/