I rebuild the Rotary Mek 10X Rubber band Tommy toygun, designed by Julian Marsh ( Rubbergunner on Youtube). Using his Book ( amazon) I was able to recreate his design. I changed some dimensions to fit local supply availabilty.
It can hold 70 rubber bands at a time and it is able to fire it all in about 3 seconds.
I brought this toygun to the office to surprise my colleagues. They Loved my Tommy Toygun