The portable, shoulder-fired SA-7 Grail missile was one of many anti-aircraft weapons extensively against American aircraft conducting bombing raids in North Vietnam. On the ground, the DP 7.62mm light machine gun (the equivalent to the U.S.-made M-60) was based on a Soviet design and manufactured in both the Soviet Union and China. The simple but deadly accurate AK-47, known to many as the “peasant’s rifle,” was shorter and heavier than the M-16, with a lower rate of fire (up to about 600 rounds per minute). It was extraordinarily durable, however, and was able to fire 7.62mm bullets either automatically or semi-automatically from a 30-round clip at a rate of up to about 600 rounds per minute, at a range of up to 435 yards. Another widely used semi-automatic rifle, the SKS carbine or “Chicom,” was the Chinese version of the AK-47, with a slightly greater range.