I have no direct experience with their rifles, but LaRue couldn't be beat in terms of rails and mounts a few years ago. There are, however, some companies out there now that I believe are equal or even better than LaRue, especially with QD Aimpoint mounts.
Of course, I enjoy doing business with a Texas-based company, and dillo dust is always welcome.
"Hee cannot be a gentleman whych loveth not a dogge." --Anonymous, The Institucion of a Gentleman (1555)