Magpul MS1 MS4 QD Adapter - Black873750010823 Magpul continues to grow and develop based on innovation, simplicity, and efficiency. At Magpul, mission driven requirements inform their product design, materials, and manufacturing, focusing on efficiency without sacrificing quality or performance. The MS1 MS4 Adapter adds a heavy duty QD sling swivel and a custom steel connection ring to MS1 Slings. Add this mount and one additional QD sling swivel to the MS1 for single point two point