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