Ian McCollum of Forgotten Weapons posted a short video review of the new Vickers Guide AR-15 Volume 1 (Second Edition). Check it out at the link below when you have time.
Book Review: Forgotten Weapons Vickers Guide AR15 Volume 1 Second Edition
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 