WOLTIS Quick Release QD Swivel Offset Mount Picatinny Rail Sling Attachment Black The QD Mount Features Easy Installation. Designed to Mount the Popular Push Button QD Sling Swivel Simple Push Button Operation Allows Quick and Simple Release of the Sling for Removal or to Attach it at a Different Point. Quicky Attaches and Detaches with Push of a Button Compatible with any Standard Push Button QD Sling Mount