As you may see here a simple 5ft gun, the potential is in the slingshot mechanism, allowing to ranges of 50ftpls.I will not be posting as I believe it is simple enough to build from the pictures. If you wish, simply just ask for more pictures.
Oh and also, fold the #64 rubber band over, or if possible simply use a #34
Have fun sensibly with my Pistol!!!
Do not hesitate to ask for help