Just a guess, but the Vltor looks like one of the largest (external dimensions) railed hand guards available for the M14 types. Some of the other rail options, (Ultimak, Blackfeather) are very low profile, and require that the underside of the actual rail needs to be relieved in order to clear a heavy profile barrel. I'm thinking that, depending on your skill level, you would have a better chance of doing it with the Vltor. Perhaps a member can post a picture of the underside of one, showing the mounting method. It will probably require that you fabricate new clamps to fit the heavy profile barrel. Please keep us informed if you decide to undertake the project.