The Monstrum Tactical Picatinny to Keymod Rail Adaptor allows for the mounting of keymod accessories to traditional Picatinny rail systems. Fast modular attachment of universal keymod accessories to your older Picatinny rifles. The rail is crafted from lightweight aerospace grade aluminum and weighs 1.2 ounces. The adaptor is 2.5 inches, or 3 keymod hole sections, in length. Picatinny to Keymod Rail Adaptor allows for the mounting of keymod accessories to traditional Picatinny rail systems. Fast modular attachment of universal keymod accessories to your older Picatinny rifles crafted from lightweight aerospace grade aluminum and weighing 1.2 ounces. Adaptor is 2.5 inches, or 3 keymod hole sections, in length.