The AK-47 is a selective-fire, gas-operated 7.62×39mm assault rifle, first developed in the USSR by Mikhail Kalashnikov. It is officially known as Avtomat Kalashnikova (Rọ́síà: Автомат Калашникова). It is also known as a Kalashnikov, an "AK", or in Russian slang, Kalash. Table data are for AK-47 with Type 2/3 receiver Àṣìṣe ìtọ́kasí: Invalid <ref> tag; no text was provided for refs named Worldbank.org "AK-47 Inventor Doesnot Lose Sleep Over Havoc Wrought With His Invention". Fox News. 6 July 2007. http://www.foxnews.com/story/0,2933,288456,00.html. Retrieved 3 April 2010.  Dockery, Kevin (2007). Future Weapons. p. 102. Àṣìṣe ìtọ́kasí: Invalid <ref> tag; no text was provided for refs named crusader80.co.uk Bidwell, Shelford. The Encyclopedia of land warfare in the 20th century, p. 199. Spring Books, 1977.