Groza

The OTs-14 Groza, manufactured in Russia by TsKIB SOO since 1994, is a 7.62mm bullpup AK-47 conversion.

This gun is the definition of "size doesn't matter". This gun looks like an SMG, but it probably reminds you more of an AK-47 when you fire it. It is the only other assault rifle that uses 7.62 and so it has to be quite a powerhouse. This gun is far more controllable compared to the AK-47 at the expense of range.