Abstract: An automatically-repeating, rapid-firing rubber band gun with an ammunition powered operating system. The gun includes a mechanism for retaining, releasing and projecting a plurality of stretched rubber bands, with the release of the rubber bands occurring in such a manner as to allow the harnessing of a portion of the elastic potential energy present in the rubber bands to perform work upon the mechanism. Work performed upon the mechanism results in the mechanism moving relative to a static structure within the gun, and this relative movement affects a temporal sequencing of the release of the rubber bands. A trigger system provides for control of rubber band discharge by way of alternately inhibiting or allowing rubber band release. A structural frame supports the operating system and provides for the gun to be manually operated.