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Corvus Defensio receiver rails offer a sturdy, continuous mounting solution for attaching optical and optronic sights, open sights, laser designators, and other accessories to the Steyr AUG receiver. Depending on the AUG version—A2, A3, M1, USR, or BMI—the number of slots, length, and interfaces vary; a common feature of all versions is the interface for direct mounting of Trijicon ACOG scopes without an adapter, which reduces mounting height and offset.