The ArmaLite AR-10 is a 7.62×51mm NATO battle rifle developed by Eugene Stoner in the late 1950s and manufactured by ArmaLite, then a division of the Fairchild Aircraft Corporation.
Barrel length: 528 mm (20.8 in)
Effective firing range: 600 m (660 yd) (700 m (770 yd) with A.I. 3.6× telescopic sight)
Rate of fire: 700 rounds/min (fully automatic), variable (semi-automatic)
Feed system: 20-round detachable box magazine