M16A1 Full Auto Year of Manufacture

[Galilman]

Hi everyone.
I have a recently acquired full auto Colt M16A1 and I am trying to find its year of manufacture from the serial number without any luck.
Serial number is: 9326646
No case deflector
No US property marking
Birdcage flash hider
teardrop forward assist
Ive attached a few photos and any help dating this rifle would be helpful. I imported it into New Zealand from the Czech Republic about 3 years ago.
Cheers

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