SB Tactical SBT5K Brace for HK MP5K - BlackThe SBT5K enhances your MP5K with an integral side folding molded polymer end cap. FITS: 2 PIN K MODELS SUCH AS HK SP89 HK SP5K PTR 9KT CENTURY ARMS AP5 P & AP5 M MOST SP5K CLONES (9MM ONLY). FEATURES Complete assembly ready to install Molded polymer end cap with QD socket Integral side folding mechanism Comes with adjustable nylon strap for custom fit US veteran designed and proudly made in the USA Due to varying tolerances between roller lock