AK47

The AK-47, officially known as the Avtomat Kalashnikova, is a gas-operated, 7.62×39mm assault rifle, developed in the Soviet Union by Mikhail Kalashnikov. It is the originating firearm of the Kalashnikov rifle (or "AK") family. 47 refers to the year it was finished. (Also this is prob one of my, "most effort" weapons)