The original rail ladder covers for the Daniel Defense RIS-II on the M4 Block2 and the Mk18 are from Ergo. Here are the original FDE Ergo rail ladder covers. Pretty simple, but this is what you need to finish your clone, or maybe to start a new project... The rail covers come to us as new items from Ergo and Daniel Defense, and occasionally as additional items with Daniel Defense factory rifles. All are new and used, packaged as a set of three.
Yes, there are fakes out there, especially sold on eBay and Amazon. The fake ladder covers do not have the same heat resistance, flexibility and durability that a real Ergo ladder rail covers has. This is 100% authentic.
Set of three (3) Ergo rail ladder covers. FITS ANY PICATINNY RAIL
Charlie's Custom Clones also offers FDE colored rails here: Daniel Defense FDE ladder rails from Ergo