ERGO 5-Slot M-LOK Low-Pro Cantilever U.M.P. Rail Black 4768. Specifications for ERGO 5-Slot M-LOK Low-Pro Cantilever U.M.P. Rail: Manufacturer: ERGO Color: Black Fabric/Material: 6061-T6 Aluminum Gun Rail: Picatinny Gun Make: AR Platform Kalashnikov...