Just bragging a bit, I suppose
My first AR-15. She's old, but solid.
From the markings I can find without taking it apart:
Late '70s vintage
Palmetto Armory lower, not Palmetto State
Barrel bears Colt proof marks, may be a full Colt upper
Solid shooter based on the few times I've fired it.
Yes, it's a grainy pic, but you get the idea
This is going to be a loooong work day