I said I was going to do it and here it is. After some hours tinkering in the workshop with my son, this is what I ended up with. I decided to use a firecracker instead of powder and BB's for projectiles because that's what I had readily available. Didn't spend anything but time.
Here's the solid steel roller I started with. It's a roller from an old copier.
A couple pics of drilling and shaping the barrel.
And here's a video of the little thing in action.
boom stuff :: DSCN0467.flv video by Suprtek - Photobucket
Anyone with a few basic tools can make one of these and they are a blast to play with. (pun intended)
Here's the solid steel roller I started with. It's a roller from an old copier.
A couple pics of drilling and shaping the barrel.
And here's a video of the little thing in action.
boom stuff :: DSCN0467.flv video by Suprtek - Photobucket
Anyone with a few basic tools can make one of these and they are a blast to play with. (pun intended)