A while ago, I was talking to a fellow gun enthusiasts and brought up the question: "Why isn't there a auto-loading handgun chambered in 7.62x39?" I was told that it wouldn't work and just left it at that based on my assumption that the person knew exactly what they were talking about (perhaps he does and my recent discovery changes nothing). Fast forward a month and a half, I stumble upon the FN Five-seveN. To me, this round looks like a scaled-down version of the 7.62x39. So, I am, once again, wondering why no one is making a handgun that is chambered in this caliber. Now, I know that a handgun in this caliber would require large grips, but in my opinion, it's definitely doable. To me, this would be a phenomenal round to have in the palm of your hands and I would have no problem with spending a nice chunk of change on such a firearm. I am also willing to be that others would as well. So, my question to you guys is: Why is there not a pistol chambered in this caliber? What is holding it back?