Share This Article 1. Gun makers, Hopkins and Allen, was the most prolific producer of this kind of weapon. Military side-arms Shotguns Hunting rifles Spur trigger pistols 2. The M1918 Browning Automatic Rifle became standard issue to the US Army in this year. 1941 1917 1938 1918 3. These were the M42 “Duster” anti-aircraft systems’ main weapons. Four 20mm Oerlikon cannons One 60mm Raytheon cannon Four .50 caliber Browning Machineguns Two 40mm Bofors cannons Loading …