The sombitch is heavy enough as it is. And for the pricetag on those stocks, I can have a fully outfitted AR-15.
There is also something to be said about how awesome an M1A looks already.... Putting too much tacticool on it really takes away from a very classing looking rifle.
Black fiberglass, nice scope, and maybe a bi-pod are about the only thing I would put on an M1A