VISM Grip Adapter Cap Black Polymer DLG-080. It features an integrated sling loop for attaching slings. The adapter is made of quality reinforced polymer composite. All mounting hardware is included. Specifications for VISM Grip Adapter Cap: Manufacturer: VISM Fabric/Material: Polymer Features of VISM Grip Adapter Cap Fills in the rear opening of the shotgun grip adaptors Integrated sling loop for attaching slings Package Contents: VISM Grip Adapter Cap All Mounting Hardware VISM DLG-080: Grip Adapter Cap Black Polymer