The Heckler & Koch HK23E LMG is a germany-made select-fire lmg chambered in 5.56x45mm NATO, introduced in 1970. Primary use: military. Type: Machine Gun Action: Select-Fire Caliber: 5.56x45mm NATO Capacity: 100 Year introduced: 1970, Germany Weight: 256 oz Overall length: 47.5" Status: Active Intended use: military