I photographed what I believe to be M13 MGMC (Muti-Gun Motor Carriage) Half Track examples at the National Museum of Military Vehicles in Dubois WY
The earlier two-gunned M13 was replaced by the M16 “Meat Chopper” MGMC with more lethal quad guns in the mount.
M13 MGMC Half Track
assumed to be an M3 until informed otherwise
NMMV Dubois WY 2025
M13 MGMC Half Track [4026357]
assumed to be an M3 until informed otherwise