I would like to add a 12-13" rail onto one of my AR's. The problem is that I want to keep the front A2 block on this gun. I know there are choices like the DD that will allow you to retain the A2, but everything I've seen so far is a quad rail. Does anyone know of a product that is a floated non quad, as I don't need that much rail space and would like to keep this one as light as possible. Thanks in advance