The Steyr Arms AUG/USA A1 5.56 NATO is a austria-made semi-automatic rifle chambered in 5.56 NATO, introduced in 1988. Primary use: sport, military, hunting. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 1988, Austria Weight: 88 oz Overall length: 28.15" Status: Active Intended use: sport, military, hunting