THE AR PLATFORM REDEFINED. The SR-556® offers Ruger's legendary rugged reliability, and comes factory standard with a host of accessories that today's shooters demand. Employing 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. The end result is significantly improved performance over gas driven rifles.

Manufacturer Number 5905
Type Rifle
Action Semi-Auto
Barrel Length 16.12"
Caliber 5.56 NATO/.223 Rem.
Capacity 30
Finish Manganese Phosphate/Hardcoat Anodized
Grips Black Synthetic, Collapsible
Sights Folding Battle Sights
Weight 7.40 lbs

Item # RGR-5905