DS Arms does stock firing pins for the FNC. The class III FNC owners seem to comprise the majority of the FNC "cult" (for lack of a better word). The parts that get into the US are bought-up quickly since the class III rifles burn up parts at a rapid rate.
Guys I don't usually give such a major endorsement of any firearm after little exposure and trigger time, but the FNC is top shelf. If our troops were carrying this rifle (instead of the FN contract M4's and Colt contract M16's), the FTF, FTE incidents (like Jessica Lynch) would be few and far between.
