The SBT5K enhances your MP5K with an integral side-folding molded polymer end cap. This stabilizing brace fits 2 PIN "K" models such as HK SP89, HK SP5K, PTR 9KT, Century Arms AP5-P & AP5-M, and most SP5K clones (9MM only). It features a complete assembly ready-to-install, a molded polymer end cap with QD socket, and an integral side-folding mechanism. The brace comes with an adjustable nylon strap for a custom fit. It is US veteran designed and proudly made in the USA. Due to varying tolerances between roller lock manufacturers, gunsmith installation or fitting may be required.