Magpul Industries QD Sling Swivel Black MAG540. These Swivels from Magpul Industries are made from manganese-phosphate finished steel. Magpul Industries MAG540 Sling Swivels are easy to install sturdy and stay firmly attached until you actively detach them. Get superior fit and finish with the Magpul Industries Quick-Detach Sling Swivel. Specifications for Magpul Industries QD Sling Swivel: Manufacturer: Magpul Industries Color: Black Fabric/Material: Steel Condition: New Attachment Type: Quick Detach Finish: Manganese Phosphate Features of Magpul Industries QD Sling Swivel Black MAG540: Push-button quick-detach sling swivel for 1-1/4 in webbing Manganese-phosphate finished steel Compatible with QD sling attachment points Combine with MS1 Sling for dedicated two-point sling or with MS1 MS4 Adapter for two to one-point convertible sling. Package Contents: Magpul Industries QD Sling Swivel MAG540 Magpul Industries MAG540: QD Sling Swivel Black