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Pistol-Driven Operating System
Full-Length Picatinny Top Rail
The SR-556 offers Ruger's legendary rugged reliability and comes factory standard with a host of accessories that today's shooters demand. The SR-556 employs a patent-pending, chrome-plated, two-stage piston driven operating system that provides the user with a cleaner, cooler running, reliable firearm that is truly state-of-the-art. The chrome-lined gas block and chrome-plated piston and regulator work together to provide a smooth power delivery stroke to the bolt carrier. The by-products of the gas system are vented out the bottom of the gas block, away from the bolt carrier, keeping the action clean and free from contaminants. This model is designed for state compliance with a 10-round magazine and a non-threaded barrel.
Every SR-556 is built with a hammer-forged, chrome-lined mil-spec 41V45 barrel that ensures accuracy and longevity. A Hogue Monogrip pistol grip adds comfort when carrying or shooting. Other features include a chrome-plated bolt, a one-piece bolt carrier and extractor, and a set of rail covers. Fixed stock. Maryland compliant.