
Note that only two are out of sequence, and not by much. These were all new rifles that were shipped directly from major distriburors. I have checked my records, and here are several new Colt AR-15 rifles that were booked into my bound book on the dates given: SP1015XX on J(a Carbine that cost $319.95), SP1057XX on Septem(a Carbine that cost $329.70), SP1241XX on 7-17-80 (a Carbine that cost $396.40), SP1492XX on Aug(a Carbine that cost $414.67), SP1569XX on Septem(a regular rifle that cost $377.09), SP1514XX on Octo(as regular rifle that cost $370.57), SP1561XX on Nobem(a regular rifle that cost $377.09).

That may well be the explanation, one that I missed in my initial post. Looking at the progression of serial numbers on the charts, it appears production was increasing each year, and I do seem to recall that AR-15s kind of took off in the late 1970s, what with the introduction of the Carbine and the like, and the popularity of auto sears, etc.

Second, the 19 production combined was REALLY big, since the charts show 1978 procution beginning at SP83400.

Other than time travel, I have three possible explanations for your rifle, all of which may be wrong.įirst, and I do not mean to insult your intelligence because I think you posted on the issue when it came up recently, is that you are taking the SP1 model and adding the "1" of the SP1 to the front of the serial number, which I think you and I agreed was happening on a previous post (which I cannot find now) where a guy was looking for the age of his rifle.
