The G3A4 is the folding-stock variant of the G3A3, fitted with a side-folding metal stock for airborne and vehicle crew use. The A4 designation across HK roller-lock rifles denotes the folding stock. The barrel length on the G3A4 is identical to the A3 at 17.7 inches; the 12.4-inch folded length refers to overall folded measurement. Type: Rifle Action: Semi/Full-Auto Caliber: 7.62x51mm Capacity: 20 Year introduced: 1964, Germany Weight: 166.4 oz Overall length: 26.5" Status: Discontinued Military use: Yes Intended use: military, law_enforcement, service