The Geissele Super Duty SD556 18" Luna Black Rifle is a modern sporting AR-15 platform built around an 18-inch barrel and a direct impingement, semi-automatic operating system. Chambered in 5.56x45mm NATO / .223 Remington, this rifle is configured with a detachable magazine system and a flash hider at the muzzle, offering a versatile setup for shooters who want a refined, optics-ready rifle.

This Super Duty configuration uses a polymer stock and a flat-top upper that is ready for your choice of optic, making it well suited for range use, training, and general-purpose sporting applications. The 18-inch barrel balances velocity and handling, while the Luna Black finish provides a clean, understated look. Backed by Geissele’s reputation for precision machining and reliable performance, the SD556 is designed to deliver consistent results shot after shot.

• Manufacturer: Geissele
• Model: SD556 Super Duty Rifle
• Caliber: 5.56x45mm NATO / .223 Remington
• Action: Semi-Automatic, Direct Impingement
• Barrel Length: 18"
• Magazine Type: Detachable
• Muzzle: Flash Hider