This will fire anything thats roughly the size of a domino or a small fold-back clip. The K-nex at the front is not necessary but it will cut down wear on the rubber band.
The materials you will need are;
1: Rubber band
2: Bit of wood (around 40cm) but make sure it works with the elastic band
3: 19mm fold-back clip
4: 31mm fold-back clip
5: 4 thumb tacks
6: 3 screws
7: K-nex (optional if you want the rubber band to last)
8: another bit of wood for the handle (optional but recommended)
9: Drill
10: Pliers
11: any tools I've missed
N.B. I am not responsible for anything you do with this but would advise no shooting at people etc...
Here it is firing...
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