At first glance the AK47u looks like a standard AK47 but with a compressable stock and smaller reciever, although it does more damage than any other submachine gun. You may've mistaken it for a weaker version of the AK47 due to it's slow aim speed but it's a bog standard submachine gun only with high damage and sudden damage deacrease past a certain range. It's seen quite often in the earlier points of the game. It's seen in "FNG" with an M203 attached to it but isn't available for use, It is later seen with Nikoli in "Blackout" and "Hunted".