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.

Specifications and Features:
Ruger SR-556E semi-automatic rifle
5.5mm NATO/.223 Remington caliber
16.12" cold hammer-forged, MIL-SPEC 41V45 barrel
1:9" RH twist, 6 grooves
30 round capacity
Black synthetic, 6 position telescoping M4-style buttstock
Black oxide/hard coat anodized finish
2-stage pistol with adjustable regulator
A2-style pistol grip with finger groove
Flattop receiver with Picatinny rail
Ruger Rapid Deploy sights
32.75" to 36" overall length
10.25" to 13.50" length of pull
7.25" tall
2.50" wide
Weighs 7.36 pounds
Includes Magpul PMAG and soft-sided case