Colt AR-15 serial number info

[smak_daddy]

Does anyone know a website where I can find out the date my Colt AR-15 was manufacured by its serial number? I know Colt will send me the info for 30 bucks. I am hoping to get it for free though.

 

[.45colt]

This may help.

http://www.biggerhammer.net/ar15/variants/