Share This Article 1. The M1918 Browning Automatic Rifle became standard issue to the US Army in this year. 1938 1917 1941 1918 2. 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 3. Gun makers, Hopkins and Allen, was the most prolific producer of this kind of weapon. Hunting rifles Shotguns Spur trigger pistols Military side-arms Loading …