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Seems rather unlikely it is anything other than a Colt AR-15 - I know when I fill out my Form 4s or my form 5320 if I ever mix up the serial by one digit or indicate a different barrel length or make any kind of error, I immediately get a call from the ATF that something is not matching up correctly. My question is not if it's a legit Colt AR-15 but if there is anyway of tracing the date of manufacturer from the serial.
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There is about a 0% chance the receiver, as shown, or the serial number applied to it, was done by Colt ....maybe parts of it.....way too many red flags here.......that's why you're not going to be able to date it by SN.
FOIA it, and see when it was F2'd / added to the NFRTR
Might also want to pull the pistol grip and look for some "hidden" markings ..... I'm thinking Norrell or Erb
Notice any differences?
eta: The more I look at it, the more I think it isn't even a Colt front half welded to a GM rear ........ the casting is wrong, as well as all of the markings