ERGO 10-Slot 4in.400 Ultra Lite Aluminum U.M.P. M1913 Picatinny Rail w/ Ergo Rail Cover Black. These Picatinny Rails manufactured by the experts at ERGO are made of aluminum and include mounting hardware. Specifications for ERGO 10-Slot 4in.400 Ultra Lite Aluminum UMP M1913 Picatinny Rail w/ Ergo Rail Cover: Manufacturer: ERGO Color: Black Fabric/Material: Aluminum Gun Rail: Picatinny Gun Type: Rifle Gun Make: AR Platform Condition: New Features of ERGO 10-Slot 4in.400 Ultra Lite Aluminum UMP M1913 Picatinny Rail w/ Ergo Rail Cover Mounting does not require alteration of AR Handguard heat shields Package Contents: ERGO 10-Slot 4in.400 Ultra Lite Aluminum UMP M1913 Picatinny Rail w/ Ergo Rail Cover ERGO 4761: 10-Slot 4in.400 Ultra Lite Aluminum U.M.P. M1913 Picatinny Rail w/ Ergo Rail Cover Black