The RSA-QD provides a forward attachment point for the Magpul MS4 Sling and other push-button QD Slings. It is Melonite finished 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.
AR-15, Issue:11, Page:073
Big Book Catalog, Issue:73, Page:087
Big Book Catalog, Issue:73, Page:190