The HK91A3 is the folding-stock variant of the HK91, equivalent to the G3A4 in configuration. The A3 designation on the civilian HK91 series denotes the side-folding metal stock. Less common than the HK91A2 and accordingly more valuable on the collector market. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm Capacity: 20 Year introduced: 1974, Germany Weight: 166.4 oz Overall length: 26.5" Status: Discontinued Intended use: civilian, collector