This time I made one out of cardboard, entirely with desk tools and materials. No Thera band, no scroll saw, no screws.
While cardboard, if used right, can be incredibly strong, it is a b..ch to work with. You really have to take care.
The shooter holds 12 two-eurocents-coins in the mag. You can also use US dimes and M5 washers, all having about the same dimensions.
It is impressive how much power this little thing has, propelled by just 10 normal, thin office rubber bands.