Wheres the link to the Colt Model numbers guide.
Also what model has:
Chrome Bore AND Chamber
flattop (A3) reciever
lightwieght or government profile barrel 16" or 20"
1 in 7 twist
Where can I find uppers of above?
Biggerhammer.net has a pretty good chart.
I couldn't tell you what you have. I'm not that up on the models myself.