This model is based on the popular AR-15. In 1956 the American firearms manufacturer ArmaLite, designed the AR-15 off the AR-10 model. The idea was for it to use a new high-velocity round that was smaller and lighter. In 1982, Colt worked with ArmaLite to develop and redesign these sorter rifles until the design was finished and given the designation M4. Learn more about this firearm and check out other GoatGuns models inspired by it