Ergo Grip Double Loop Sling Plate Black. The Ergo Sling Plate is an ambidextrous sling adapter plate for M4-type collapsible buttstocks. Make your gun yours with the Ergo Double Loop Sling Plate. Specifications for Ergo Grip Double Loop Sling Plates: Manufacturer: ERGO Color: Black Height: 20 in Length: 4 in Weight: 0.06 lb Features of Ergo Grip Double Loop Sling Plate: Ambidextrous Package Contents: Ergo Grip Double Loop Sling Plate Ergo Grip 4970-B: Double Loop Sling Plate Black