The RSA QD provides a forward attachment point for the Magpul MS4 Sling and other push-button QD slings. Made from corrosion resistant steel, mounts on 1913 Picatinny rail, and places the attachment point at an angle optimized for comfortable two-point sling use while maintaining easy push-button access. Product Features Compatible with 1913 Picatinny Rails Low Profile, Unobtrusive Design The RSA's design is optimized for comfortable two-point sling use while maintaining easy push-button access Secure Attachment Point Provides a forward sling attachment point for the MS4 and other QD swing swivel systems