It&';s Magpul, so you know you&';re getting an awesome, robust no-frills design. It will always work when you need it. Push-button quick-detach sling swivel for 1-1/4" webbing, compatible with QD sling attachment points. Manganese-phosphate finished steel. Combine with MS1 Sling for dedicated two-point sling, or with MS1 MS4 Adapter for two to one-point convertible sling. Made in U.S.A. Push-button quick-detach sling swivel for 1-1/4" webbing Compatible with QD sling attachment points Manganese-phosphate finished steel