The HK23 is the 5.56x45mm belt-fed variant of the HK21, designed to provide light machine gun capability in the NATO standard 5.56mm caliber. Like the HK21, it uses roller-delayed blowback operation and can fire from both belt and box magazines. Type: Machine Gun Action: Semi/Full-Auto Caliber: 5.56x45mm Capacity: 200 Year introduced: 1972, Germany Weight: 264 oz Overall length: 41" Status: Discontinued Military use: Yes Intended use: military