Magpul RSA – Rail Sling Attachment, QD Socket 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. Made in the USA.
