Ruger SR-556 5.56mm NATO Two-Stage Piston Autoloading Rifle

THE AR PLATFORM REDEFINED. The SR-556® offers Rugers legendary rugged reliability, and comes factory standard with a host of accessories that todays 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.

Features
• Two-Stage Piston
• Gas Piston and Regulator: Adjustable, Four-Position Chrome-Plated
• Handguard: Quad Rail
• Sights: Folding Back-Up Iron Sights
• Buttstock: 6-Position, Telescoping M4-Style
• Barrel Material: Cold Hammer-Forged, Mil-Spec 41V45
• Barrel Lining: Chrome
• Includes Threaded Flash Suppressor
• Bolt Carrier Group: Chrome-Plated
• Rail Covers
• Pistol Grip: Hogue Monogrip
• Magazines: Three MAGPUL 30-Round PMAGs
• Soft-Sided Case

Two-Stage Piston with Adjustable Regulator provides a cleaner, cooler running, reliable firearm with superior operating endurance. The two-stage piston provides a smooth power delivery stroke to the bolt carrier. The four position gas regulator can be adjusted for optimum reliability and superior operating endurance. The gas system may be closed completely for manual operation during training or when using a suppressor.

Folding Back-up Iron Sights provide a windage adjustable rear sight and an elevation adjustable front sight that co-witness with Mil-Spec optics and can be easily removed to make room for advanced optics. The sights can be folded down with the simple push of a button or flipped up with your thumbs.