RUGER AR-556 - 5.56x45MM NATO The Ruger AR-556 chambered in 5.56x45mm NATO is a semi-automatic AR-platform rifle designed to deliver reliable performance, durable construction, and versatile operation. Built for recreational shooting, training, hunting, and general sporting use, the AR-556 features the familiar modular AR platform with practical ergonomics and dependable function. Constructed with an aluminum receiver and steel barrel, the AR-556 utilizes a direct impingement gas system with a rotating bolt. The flat-top receiver provides an optic-ready platform, while the adjustable stock and AR-style controls offer familiar handling and versatility. The rifle's durable construction and reliable operating system make it suitable for a variety of shooting applications. Chambered in 5.56x45mm NATO, the AR-556 is compatible with both 5.56 NATO and .223 Remington ammunition. This firearm does not include a magazine. Specifications Manufacturer: Ruger Model: AR-556 Caliber: 5.56x45mm NATO Action: Semi-automatic, direct impingement Receiver: Aluminum Barrel: Steel Barrel Length: Approx. 16.1 inches Magazine: Not included Capacity: Magazine not included Handguard: Aluminum / M-LOK (configuration dependent) Sights: Optic-ready Stock: Adjustable Overall Length: Approx. 32.25-35.5 inches The Ruger AR-556 in 5.56x45mm NATO offers dependable AR-platform performance, durable construction, and modern versatility in a proven semi-automatic rifle platform. Magazine not included.