It has been identified with Mod-Giri a place mentioned in the Mahabharata was the kingdom of Raja Karna. However, the first historical account of the district appears in the Travels of Huen Tsang, a famous Chinese traveller. Munger came again into Prominence in 1762 when Kasim Ali Khan made it his capital instead of Murshidabad in Bengal.
Manufacturing Gun at Munger is more than 200 years old story. During the First World War period the Munger gun manufacturers came in to the prominence and production of cartridge gun was developed. Munger was perhaps the only city in India where guns manufacturers took shape of a cottage industry and become a popular profession. During Indo-China War of 1962 the defense ministry was in need of 410 bore Muscat which was prepared by Munger Gun Factory
