3 Piece Rail Combo Pack - Our Qd Rail Mount Combo is the best combination for attaching your firearm accessories and sling. They are designed for quick and easy removal and attachment. For on the fly changes at the field, range, or tactical applications. Includes our 7 and 3 slot Picatinny rail mounts and our Sling quick connect. Designed for M-Lok Rails. Made of black anodized 6061-T6 Aluminum.