Ruger AR-556 Features The Ruger AR-556 Semi-Automatic Rifle is built with quality and performance in mind. The rifle features a 16.1 barrel with a 1:8 twist rate allowing for accuracy and consistency with a variety of bullet weights. The rifle also features a six-position telescoping M4-style buttstock providing a comfortable and customizable fit for any shooter. The rifle also has an ergonomic pistol grip allowing for a secure and comfortable grip. The rifle also features a heat-resistant glass-filled nylon handguard. The rifle also has a Picatinny rail on the upper receiver allowing for easy attachment of optics. The rifle also has a single-stage trigger for a smooth and consistent trigger pull. Ruger AR-556 Specifications Manufacturer: Ruger Model: AR-556 Caliber: 5.56 NATO Ammo Capacity: 30 rounds Barrel Length: 16.1 in Overall Length: 32.25 in - 35.5 in Weight: 6.5 lbs Stock: Six-Position Telescoping M4-Style Barrel Material: 4140 Chrome-Moly Steel Barrel Finish: Matte Black Oxide Handguard: Heat-Resistant