Well don't get me wrong, I'm not talking about knock-you-on-your-ass-for-ten-minutes hurt, more like really-painful-bee-sting hurt. I just don't like to mislead people into thinking all they'll feel is a light tap and carry on. I have shot guys sometimes and seen them double over for a good minute before calling out, but that's usually inexperienced noobs that aren't expecting it and they are caught off guard.
Our max fps in CQB is 350 fps and at close range I've had bleeders through my clothing on the top of my arm. It's routine to see guys walk out of the arena with dozens of bloody pockmarks on their bodies, arms especially. Usually it's because they were trying to be tough guys and went in short sleeves or a tank top, but sometimes someone forgets to chrono their damn gun before going in.