High Quality Content by WIKIPEDIA articles! Walt Langendorfer from Rhino International Inc, was an American inventor. He designed a gas piston system in an effort to convert the AR-15 (M16) rifle to a more reliable operating system than the standard direct impingement system.More recently, the US Asymmetric Warfare Group purchased the Gas-OperatedHK 416, a M4/M16 type rifle made by Heckler

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