I'm definitely not a Union rep, but I rode the 2013 Forces and Chargers last season at a C3 demo day on Stevens Pass. The Chargers were definitely the stiffer binding. It's also what the C3 guys all said.
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Yep. There's carbon in the base, and the carbon highback is made from a different process than the MC. Thicker. Plus no CNC coring on the base make it pretty stiff.