Here is a video of our Hybrid kicker. The first part show the elastic one and then you will see a 1 1/2 " bore 8 " stroke with one clippard storage tank repeatedly fire and make it over a bump 18' feet away with 30-40 psi. The system uses elastic assist tensioned up to the point that it can barely retract and lock the trigger mechanism for the next shot. With 60 psi it can shoot 25 '. It has a 9 inch leg and moves only 6". We can also fire with out air about 6-8 feet using only the elastic. During the 15 sec test at the end of the video we were able to get 4 shots off from 18 feet away the bump. All of them cleared but the last one that landed on top of the bump.
all this with only one clippard!
http://www.youtube.com/watch?v=g4-8BTtO0uE