Here are three images from a 3-page article that appeared in the December 1964 issue of ‘Shooting Times’ magazine discussing the ‘Colt Sporter’ rifle.
1964 December Shooting Times Colt Sporter Article
The Colt AR-15 Resource
"A site dedicated to the history of the Colt AR-15 rifles, carbines and associated items"
The Colt AR-15 Resource 