Variations in Early AR-15/M16 Rifle Buttstocks - Armament Research
Chuck Madurski A surprising—albeit subtle—variety of fixed polymer buttstocks were used on early AR-15/M16-series rifles. There are five basic types, although it does not appear that these ever received unique manufacturer’s designations. Collectors today know them as the Type A through Type E. These stocks were fitted to the Colt Models 601 through 604, and
AR-15 - Armament Research Services (ARES)
M16 (автоматична гвинтівка) - Wikiwand
Darra AKM Rifles with AR-15 Features – Silah Report
Comparison of the AK-47 and M16 - Wikiwand
From Military to Mainstream: The Evolution of the AR-15
Colt 607: The First AR Carbine
Colt 'CS' Stock – The Colt AR-15 Resource
Variations in Early AR-15/M16 Rifle Buttstocks - Armament Research Services (ARES)
How would the AR-15 fare in combat, compared to current service