The M16 Multiple Gun Motor Carriage (M16 MGMC) also known as M16 half-track, was a US self-propelled antiaircraft gun built during World War Two. The chassis of the half-rack armored personnel carrier was used to build various variants of self-propelled guns. They were tested on training grounds. Some of them were accepted for military service, series production and then they would see combat. These mainly included self-propelled antiaircraft guns armed with large-caliber 12.7 mm machine guns. In the Autumn of 1941, the first vehicles of this type were tested. The basic requirement of their design was to combine the half-track transporter chassis with a self-propelled revolving turret, the very same as the ones mounted on the bomber aircraft.