<human>:  Who designed the Armalite AR-15?
<bot>: The AR-15 was designed by Eugene Stoner, who also designed the M1 Garand. The AR-15 was first designed in the early 1960s, and was first mass-produced in 1963. The AR-15 is an assault rifle that is capable of firing a number of different calibers, including 5.56mm NATO, 7.62mm NATO, and.308 Winchester.