Post-AWB lightweight-profile XM15 with a pencil-profile 16-inch barrel and M4 collapsible stock. The Superlight prioritized weight reduction over sustained fire capability — the thin barrel heats faster but reduces overall rifle weight below 6 lbs unloaded. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2004, United States Weight: 88 oz Overall length: 32.5" Status: Discontinued Intended use: Recreational Shooting, Hunting