I would add to Stone's advice that the very tippy-tippy-top tier manufacturers like LMT (and obviously KAC, LWRC, and H&K) have probably sunk some R&D bucks into every nook and cranny of that fancy rifle to the extent that "Mil-Spec" and "TDP" are akin to amature hour gunsmithing. I'd be hard pressed to replace or otherwise "upgrade" anything on such a rifle, not that FCD wouldn't be a great addition, just less likely to be better than the stock part.

You could always have a mark engraved on the LMT cam pin. Prestige man, PRESTIGE!!!