The M16 rifle, officially designated Rifle, Caliber 5.56 mm, M16, is the United States military version of the AR-15 rifle. The rifle was adapted for semi-automatic, three-round burst, and full-automatic fire. Colt purchased the rights to the AR-15 from ArmaLite, and currently uses that designation only for semi-automatic versions of the rifle. The M16 fires the 5.56×45mm NATO cartridge. The rifle entered United States Army service and was deployed for jungle warfare operations in South Vietnam in 1963, becoming the U.S. military's standard service rifle of the Vietnam War by 1969, replacing the M14 rifle in that role.

M16 in SupervolcanoEdit

Like many police forces, the San Atanasio PD had M16s in their armory for SWAT use. When Lt. Colin Ferguson was put in charge of security for a shipment of crude oil from San Pedro to refineries in El Segundo, he made sure to issue M16s to the officers he selected for the detail.[1]

  1. All Fall Down, pgs. 78-79, 85, HC.

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