Easiest and cheapest way to improve your ar - ERGO Modular Wedgelok Rail Covers

You can't go wrong with these. They sit tight and don't fall out, even when trimmed down to just one section. I bought the grey and they match the Magpul grey very well. Adds a great gripping surface to your rail and protects your hands from a hot barrel to boot. The only thing I don't like about them is the logo stamped on each section, but it is small enough that you hardly notice it.