This is a new Heckler & Koch picatinny rail for optic mounting compatible with MP5/SP5 pattern firearms. The Heckler & Koch SP5/SP5K Picatinny Rail w/ Modular Top Rail has been created to make sure you have a stable platform on which to mount your favorite optics. Made using incredibly durable and long lasting materials and construction, this mount from Heckler & Koch is made to give you year after year of reliable and efficient service. The manufacturer’s part number is 50226207.