Today I have Kalashnikov USA's KP-9 (which is a virtually exact semiauto copy of the Vityaz SMG) out at the range. I chose the most suitable ammo to try it out with; slightly rusty steel-case Tulammo. And it just ate it all up. The KP-9 does not have the best trigger or the lightest recoil (although neither is actually bad), but it simply runs like flawless clockwork - and it easy to hit with to boot.