The HKPDW™ Pistol Stabilizing Brace® is 3-position adjustable and is comprised of a 6061 hard-coat anodized aluminum adapter, steel rods, and an integral QD sling socket. FITS: HK SP5, CENTURY ARMS AP5, ZENITH ZF-5, MOST MP5 CLONES (9MM ONLY). DOES NOT FIT TWO PIN MP5K MODELS ...