DoubleStar RMSS Rail Mounted Sling Swivel Black. Specifications for DoubleStar RMSS Rail Mounted Sling Swivel: Manufacturer: DoubleStar Color: Black Included Accessories: True Rivet Fabric/Material: 7075 T6 Aluminum Gun Type: Rifle Features of Doublestar RMSS Rail Mounted Sling Swivel Material: aircraft aluminum QD swivel not included Package Contents: Doublestar RMSS Rail Mounted Sling Swivel DoubleStar DS515: RMSS Rail Mounted Sling Swivel Black