"When did the AR-15 first become available to civilians?... Colt sent a pilot model rifle (serial no. GX4968) to the BATF for civilian sale approval on Oct. 23, 1963. It was approved on Dec. 10, 1963, and sales of the "Model R6000 Colt AR-15 SP1 Sporter Rifle" began on Jan 2, 1964. The M16 wasn't issued to infantry units until 1965 (as the XM16E1), wasn't standardized as the M16A1 until 1967, and didn't officially replace the M14 until 1969. Colt had been selling semi-automatic AR-15's to civilians for 5 years by the time the M16A1 replaced the M14."