The AR-10 is an American battle rifle made by Armalite firing the 7.62mm NATO round. The AR-10 was designed for controllable full auto fire, and was one pound lighter than comparable battle rifles. The weapon was introduce in 1956, but never adopted by the US military, only seeing used by a few small 3rd-world countries, as well as some sales of the civilian versions. The weapon was also the basis for the highly successful AR-15 or M16 assault rifle.