The Steyr AUG A3 SA (Semi-Auto) is the US civilian import configuration of the A3, featuring a semi-automatic trigger group replacing the original two-stage select-fire mechanism. The NATO-standard top Picatinny rail replaces the original optical housing, allowing standard scope rings. Standard AR-15 STANAG magazine compatibility via an optional adapter. The closest currently-available production version of the Austrian StG 77. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2012, Austria Weight: 8 oz Overall length: 27.6" Status: Active Intended use: Tactical / Defense, Home Defense