Remington/Bushmaster ACR (Adaptive Combat Rifle) Enhanced — modular rifle with quick-change barrel system (tools not required), folding adjustable stock, and ambidextrous controls. Designed as a potential M16/M4 replacement; civilian version released 2010. Complex design led to limited adoption. Type: Rifle Action: Gas-Operated Caliber: 5.56x45mm NATO Capacity: 10 Year introduced: 2010, USA Weight: 112 oz Overall length: 44.25" Status: Discontinued Intended use: sport, self_defense