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- Built on Ruger's proven expertise and precision manufacturing standards, these AR accessories are designed for compatibility with mil-spec AR-15–style firearms and receivers, including the Ruger Harrier™ rifle and Ruger AR Lower receiver. At Ruger, we're focused on continuing to evolve alongside the needs of today's shooters. From ground-up builds to routine maintenance and upgrades, Ruger AR accessories are engineered to meet the demands of today’s modern sporting rifle enthusiasts, built to the highest standards of quality and reliability.