Watch Sadisflix. Tank commander Kalashnikov is severely injured in battle in 1941. The accident leaves him incapacitated and unable to return to the front line. While recovering in the hospital he begins creating the initial sketches of what will become one of the world’s most legendary weapons. A self-taught inventor, Mikhail Kalashnikov, is only 29 when he develops the now iconic assault riffle — the AK-47.