During the rule of Mohammad Reza Pahlavi, the Iranian military and law enforcement were equipped with a variety of submachine guns of Western and Eastern origins. Some were locally produced while others were imported in limited numbers. The main Persian word to describe a submachine gun is mosalsal (مسلسل in the Persian alphabet) which loosely means a ‘small arm that shoots continuously’. Here we will take a close look at examples of submachine guns that were imported or produced locally by the Iranian government during the rule of Mohammad Reza Pahlavi between 1941 to 1979 based on the existing information and photographic evidence. Also included in this article is a podcast interview with the piece’s author Yousef Riazi.