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 a 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: Two 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.

Firearm Specifications
Caliber: 5.56mm NATO / 223 Rem.
Stock: Black Synthetic Collapsible
Finish: Manganese Phosphate / Hardcoat Anodized
Sights: Folding Back-up Iron Sights
Height: 7.75 in.
Barrel Length: 16.12 in.
Overall Length: 32.75 – 36.00 in.
Width: 2.50 in.
Weight: 7.94 lbs.
Twist: 1:9 RH
Grooves: 6
Length of Pull: 10.25 – 13.50
Capacity: 30