It's all stock. I'm considering some upgrades though... I'd like to go to SRAM shifters and derailers rather than Shimano. I'd also like to upgrade the front shock from the 80mm to 100 or 120mm.
I gotta add... with bikes of this type, the only "stock" components are the frame, the crank, and probably the handlebars. The rest of the components are made up of a standard mix but the configuration can change from bike to bike depending on parts availability.
For example, I also have a KHS XC104. The components that are on it are better than what is listed on the KHS site, but it was sold as stock.