An AR-15-style rifle is any lightweight semi-automatic rifle based on or similar to the Colt AR-15 design. The original ArmaLite AR-15, its predecessor, was a scaled-down derivative of Eugene Stoner's ArmaLite AR-10 design and featured selective fire. Tech Zoo #rifle #machine #design #technology #mechanism | Tech Zoo

Armalite: AR-15? What does AR even stand for? :: Guns.com

Gun Review: Armalite M15A4TN - The Reloaders Network

How To Assemble An AR-15 Lower Parts Kit & Stripped Lower Receiver

LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

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TFB REVIEW: The New SureFire OBC - AR-15 Optimized Bolt Carrier