I have a 1977 SP1 Sporter with a serial number of SP77XXX. I also have a 1981 SP1 Carbine that is numbered SP149XXX. Serial number SP189161 is an early-1980s production. As was mentioned, likely 1983-84. It also appears that this may be a franken-build as the pivot pin is not correct for a SP1 Sporter or Carbine.
"A Bad Day At The Range Is Better Than A Great Day Working"
USMC Force Recon 1978-1984
US Air Force Res. 1995-2004 (Air Transportation)
M16/AR15 shooter since 1978, gun collector and AR builder since 2004
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