A friend brought an empty case over to my house to ask me if I had seen one. It was the 5.7 x 28. I showed him an ad I saw in a shooting magazine. But, I really have little info other than what FN tells you to try to get you to spend $1300 on a high powered 22 pistol. Anyone got any first hand knowledge on this gun? Ever shot one? Info on bullistics? Anything is appreciated.