Web site below suggests a method to determine.
https://www.ar15.com/forums/ar-15/Colt_ar15_date_of_manufacture____How_do_I_determine_this_/118-346202/
Quoting:
Posted: 10/16/2007 2:17:00 AM EDT
Originally Posted By dasanii19:
How do I figure out the date of manufacture on my Colt LE6920?
Take the hand-guards off and the date of manufacture will be on the barrel.
This is actually the barrel manufacture, but at Colt this is usually within a very short period of time. The date is offered as month and year.
If you have the original box and wrapper, look on the cellophane wrapper - the manufacture date is usually stamped on it
Or call Colt and ask them. With serial number they will give you month/year
HTH
This information might be easily available ar any arm store
SOURCE: what year is manufacture date of colt serial # V22782
Colt.com does not recognize the serial number in their basic search. You can request information from their archive service at
http://www.colt.com/Catalog/ArchiveServices.aspx
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