The SR-556 offers Ruger's legendary rugged reliability and employs 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, and 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. This results in significantly improved performance over gas-driven rifles. The Ruger SR-556E features rapid deploy sights, one PMAG magazine, a black oxide/hardcoat anodized finish, and a flattop receiver with a Picatinny rail that extends the full length of the handguard. Additional rails may be purchased for the 3, 6, and 9 o'clock positions.
- Caliber: 5.56 NATO/223 Remington
- Barrel Length: 16.12"
- Capacity: 30 Rounds
- Stock: Black Synthetic, Collapsible
- Finish: Black Oxide/Hardcoat Anodized
- Sights: None
- Height: 7.25"
- Overall Length: 32.75" to 36"
- Width: 2.5"
- Weight: 7.36 lbs.
- Twist: 1:9" RH
- Grooves: 6
- Length of Pull 10.25" to 13.5"
E 5.56 NATO 16.12" Synthetic/Black Aluminum