The M60A1E4 was a conceptual variant that explored using a variety of distant managed weapons, including a 20mm gun as secondary armament. A mock-up of the design and style utilizing the Type C turret was created. A US M60A3 deployed for Reforger 82. A sensor mast of the new M21 https://hoytmachineguns.com/product/walther-mpk-9mm-submachine-gun-5088/