The HK23 is the 5.56x45mm light machine gun based on the HK33 platform, designed to provide squad-level sustained fire in the intermediate caliber. It was produced primarily for military contracts and is virtually nonexistent in civilian semi-automatic form. Documented here as a catalog entry for completeness of the HK roller-delayed family. Type: Semi-Auto Rifle Action: Roller-Delayed Blowback Caliber: 5.56x45mm NATO Capacity: 25 Year introduced: 1972, Germany Weight: 16.1 oz Overall length: 40.16" Status: Discontinued Military use: Yes Intended use: Military Use, Collector