https://m.media-amazon.com/images/I/...XQbQL._AC_.jpg
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We always saved some black cat fire crackers after the 4th. A 2' length of 3/4" iron pipe, a pipe cap and a short 2x4 to strap it to becomes a 20 mm cannon.
Drill a fuse hole in the end of the pipe. Insert fire cracker into the pipe with fuse through the drill hole. Screw on the cap. Insert a juniper berry into the muzzle. Light fuse. MV about 300 fps.
This is your projectile. The AZ Juniper berry.
https://i.ibb.co/yW32xQ7/Juniper-Berry.jpg
Don't try this at home. Go to a friends house.