It's not all that surprising that Mikhail Kalashnikov (pictured right, alongside Eugene Stoner, an American gun creator), who invented the automatic assault rifle, felt a burden on his shoulders. The Automat Kalashnikova 1947 or AK-47, named after its creator and the year it was developed, was developed for use by the Russian Armed Forces, who started using it in 1949. But the gun was later adopted by nations in the Warsaw Pact, and it is now used by countries all over the world, even featuring on Mozambique's flag. In Russia, Kalashnikov was hailed as a hero, and throughout his life he often defended his creation, saying that politicians were to blame for violence. However, in the year before his death in 2013 he wrote a letter to the head of the Russian Orthodox Church describing the "pain" he felt about creating the weapon and being "responsible for... deaths" as "unbearable".