C model saws can have any number of features, including Easy Start, M-tronic, or Quick braking systems. Generally a 362C is M-tronic, and a 362-CM. But not always. There are older 362 Q models that are also labeled 362C. The Q models have the large pop-up lever on the top of the back handle. M-tronic saws have no carb adjustment holes in the right side of the AF cover. As I understand it, the Q and VW arctic models cannot be on the same saw though, so its either one, and not both. R stands for the 3/4 wrap, yes, on all larger Stihl saws 362 and up. The 361 never had an R model from the factory, but they had an upgrade 3/4 wrap for it.