HK 91 Technical Specifications

Caliber	7.62x51mm (.308 Win)
Ammunition Feed	Staggered magazines; 5- or 20-round capacity
Sight Radius	22.5 inches (572mm)
Weight: with empty magazine	9.7 pounds (4.41 kg)
Barrel length	17.71 inches (449.8mm)
Overall length	40.38 inches (1,025.7mm)
Width	2.28 inches (57.91mm)
Height	8.26 inches (209.8mm)

Information courtesy of Heckler and Koch