website to find out how old my colt AR-15 sp1 is?

That info is available in "BLACK RIFLE II" from Collector Grade Publications, p. 283-284. Here are a few date ranges. Ar-15A2 commenced production in 1985. If you want, provide me your serial number with the last numbers as "x"'s, for a more accurate date

SP08250 1967
SP15473 1970
SP24201 1973
SP55301 1976
SP96401 1979
SP158201 1982
 
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