History of the Monolithic Polymer AR: From Colt to KE Arms
This video explores the history of the monolithic polymer AR-15 lower receiver, tracing its origins from early Colt prototypes in the late 60s/early 70s to its development and refinement by Cavalry Arms in 2000. It details how the design was later acquired by GWACS Armory and eventually revitalized by KE Arms with their KP-15 lower. The discussion highlights the material advantages of glass-filled Nylon for this specific design, which differs from attempts to simply make standard AR receivers from polymer due to inherent structural weaknesses. The video examines the engineering challenges and solutions throughout the evolution of this unique AR-15 component.













