It had a magazine capacity of ten rounds and a weight of about 4 kilograms. The Johnson also had a length of 116. 5 centimeters and it took the .30-06 Springfield cartridge. It was designed by the Marine Corps Reserve, Col. Melvin M. Johnson and it had a muzzle velocity of 853 meters per second. The M1941 had adjustable iron sights to help accuracy as well as low recoil. Another feature of Johnson was a bayonet mount. Although they were rejected as a standard service rifle; M1941s were still used during World War II and about 20,000-30,000 were made during the war.