Semi-automatic civilian 5.56mm variant of the HK33 for the U.S. market. Roller-delayed action in the smaller caliber, with 16-inch barrel. Imported until 1989; valued by collectors for the roller-delayed system in 5.56. Type: Rifle Action: Roller-Delayed Caliber: 5.56x45mm NATO Capacity: 25 Year introduced: 1974, Germany Weight: 160 oz Overall length: 38.5" Status: Discontinued Intended use: sport