DIE FREE CO QD CUP BARRICADE STOP/SLING ATTACHMENT A robust QD cup that serves as a hasty barricade stop. The QUICK STOP is here to get it done... quick. It has a natural anti-rotational property, and when paired with their D-NUTs becomes Q-Sert handguard compatible. SPECS Made in USA M-LOK(TM) Compatible Material: Stainless Steel Finish: Melonite QPQ INCLUDED Contents: 1 quick stop with 2 screws & D nuts in a sealed plastic bag. Mfg: Die Free Co