Soooo I actually have the V5 and it was set to "MEAN". I thought something was odd when I kept hearing about how "ugly the swirls are" Mine doesn't have "swirls" I just figured they mad the black chrome without swirls. I finally went and did some more research and found out the head doesn't come off the tube. You can take off the top cap and take off the extension tube but not the short 18350 size tube. Then I finally looked up how to put it in RMS or MEAN mode and tried it and sure enough it switched to RMS. Now I feel like a complete idiot, but I am still new to this and the guy at the store said it was the V3 so it isn't entirely my fault.