Variations in Early AR-15/M16 Rifle Buttstocks - Armament Research Services (ARES)
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
The Evolution of the Piston Operated M16/M4 Rifles – Small Arms Defense Journal
Colt Fiberglass Stock - Original 1960's - with Rubber Buttplate - AR15 / M16 - Retro Rifles
AR15 Stock Considerations & Selection — Reptilia
When The Army Resisted the M16A2, Part 3 of 3
The M16A4 Assault Rifle & New Commercial Variations - Small Arms Review
Airsoft Action - September 2021 by Airsoft Action - Issuu
Catalog On The AR-15 Rifle, PDF, Weapon Design
M16 - Armament Research Services (ARES)
Vietnam's Overburdened M16
What is the difference between an AR-15 and the military equivalent by sight alone at a glance? - Quora
AR-15 - Armament Research Services (ARES)
Colt – The Armourers Bench