While the basic platform is the same, the M16 has undergone numerous changes over the years to become the M4 that is currently in use today.
Watch this "I Have This Old Gun" segment from a past American Rifleman TV episode to see the incredible Nock Volley Gun fired.
Shooting Sports at the BSA Jamboree: Phil Schreier
Colt Model 1902 Revolver - I Have This Old Gun
Lemat Revolver - I Have This Old Gun
Ruger Mini-14 - I Have This Old Gun
Savage Model 110 - I Have This Old Gun
Steyr Model 95 - I Have This Old Gun
Browning Automatic Rifle History
Ferguson Rifle History