The 69C prefix to your serial number indicates that it was produced in the year 1969. Rifle is a great recreation of the early M16A1 of the Vietnam war period. 10,000,000 serial number range This is not your go-to place for gun laws or gun politics other people have that covered. 1972 The frame design changed over time, in three distinct series: series one being 1915–1941, series two 1947–1955, and series three being 1955–1977.