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This is just a guess on my part, but I'll bet it's close.

I'm thinking your rifle was made ca 1989-91, or around that time frame.

This was during the time when Colt was getting lots of pressure about selling "Assault Rifles". In their attempt to get rid of some of the deadly assault rifle features, i.e. flash hider, pistol grip, bayonet lug, etc., they started installing Front Sight Assemblies that had the Bayonet Lug sawed off.

Colt models made shortly after this model had a hardened block installed in their lowers as well as different size pins than M16s to prevent select fire conversion parts from being installed. They also stopped marking them "AR15" and started marking them "Colt Sporter".

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