The SR-556E offers Ruger's legendary rugged reliability, and comes factory standard with a host of accessories that today's shooters demand. Employinga patent-pending, chrome-plated, two-stage piston driven operating system that provides the user with a cleaner, cooler running, reliable firearmthat 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 arevented out the bottom of the gas block, away from the bolt carrier, keepingthe action clean and free from contaminants. The end result is significantly improved performance over gas driven rifles. This rifle has all the modifications to be state compliant.
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