During the 1980's Colt Firearms offered these posters to dealers to hang in their shops. This chart shows a complete exploded view including part names and part numbers of the entire internal mechanism for the Colt M-16A2. It was used for training sessions, and armorers training schools. This is a very rare item that would make wonderful display piece in your gun room, gun shop, or man cave. It is 4 feet long by nealy 3 feet tall on very heavy vinal type paper.